ComputerCraft 1.79 initial upload

Added the complete source code to ComputerCraft 1.79 for Minecraft
1.8.9, plus newly written README and LICENSE files for the open source
release.

src/main/java/dan200/computercraft/api/filesystem/IMount.java

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+/**
+ * This file is part of the public ComputerCraft API - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2016. This API may be redistributed unmodified and in full only.
+ * For help using the API, and posting your mods, visit the forums at computercraft.info.
+ */
+
+package dan200.computercraft.api.filesystem;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+
+/**
+ * Represents a read only part of a virtual filesystem that can be mounted onto a computercraft using IComputerAccess.mount().
+ * Ready made implementations of this interface can be created using ComputerCraftAPI.createSaveDirMount() or ComputerCraftAPI.createResourceMount(), or you're free to implement it yourselves!
+ * @see dan200.computercraft.api.ComputerCraftAPI#createSaveDirMount(World, String)
+ * @see dan200.computercraft.api.ComputerCraftAPI#createResourceMount(Class, String, String)
+ * @see dan200.computercraft.api.peripheral.IComputerAccess#mount(String, IMount)
+ * @see IWritableMount
+ */
+public interface IMount
+{
+	/**
+	 * Returns whether a file with a given path exists or not.
+	 * @param path A file path in normalised format, relative to the mount location. ie: "programs/myprogram"
+	 * @return true if the file exists, false otherwise
+	 */
+	public boolean exists( String path ) throws IOException;
+
+	/**
+	 * Returns whether a file with a given path is a directory or not.
+	 * @param path A file path in normalised format, relative to the mount location. ie: "programs/myprograms"
+	 * @return true if the file exists and is a directory, false otherwise
+	 */
+	public boolean isDirectory( String path ) throws IOException;
+
+	/**
+	 * Returns the file names of all the files in a directory.
+	 * @param path A file path in normalised format, relative to the mount location. ie: "programs/myprograms"
+	 * @param contents A list of strings. Add all the file names to this list
+	 */
+	public void list( String path, List<String> contents ) throws IOException;
+
+	/**
+	 * Returns the size of a file with a given path, in bytes
+	 * @param path A file path in normalised format, relative to the mount location. ie: "programs/myprogram"
+	 * @return the size of the file, in bytes
+	 */
+	public long getSize( String path ) throws IOException;
+	
+	/**
+	 * Opens a file with a given path, and returns an inputstream representing it's contents.
+	 * @param path A file path in normalised format, relative to the mount location. ie: "programs/myprogram"
+	 * @return a stream representing the contents of the file
+	 */
+	public InputStream openForRead( String path ) throws IOException;	
+}

src/main/java/dan200/computercraft/api/filesystem/IWritableMount.java

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+/**
+ * This file is part of the public ComputerCraft API - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2016. This API may be redistributed unmodified and in full only.
+ * For help using the API, and posting your mods, visit the forums at computercraft.info.
+ */
+
+package dan200.computercraft.api.filesystem;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * Represents a part of a virtual filesystem that can be mounted onto a computercraft using IComputerAccess.mount() or IComputerAccess.mountWritable(), that can also be written to.
+ * Ready made implementations of this interface can be created using ComputerCraftAPI.createSaveDirMount(), or you're free to implement it yourselves!
+ * @see dan200.computercraft.api.ComputerCraftAPI#createSaveDirMount(World, String)
+ * @see dan200.computercraft.api.peripheral.IComputerAccess#mountWritable(String, dan200.computercraft.api.filesystem.IMount)
+ * @see dan200.computercraft.api.filesystem.IMount
+ */
+public interface IWritableMount extends IMount
+{
+	/**
+	 * Creates a directory at a given path inside the virtual file system.
+	 * @param path A file path in normalised format, relative to the mount location. ie: "programs/mynewprograms"
+	 */
+	public void makeDirectory( String path ) throws IOException;
+
+	/**
+	 * Deletes a directory at a given path inside the virtual file system.
+	 * @param path A file path in normalised format, relative to the mount location. ie: "programs/myoldprograms"
+	 */
+	public void delete( String path ) throws IOException;
+
+	/**
+	 * Opens a file with a given path, and returns an outputstream for writing to it.
+	 * @param path A file path in normalised format, relative to the mount location. ie: "programs/myprogram"
+	 * @return a stream for writing to
+	 */
+	public OutputStream openForWrite( String path ) throws IOException;
+
+	/**
+	 * Opens a file with a given path, and returns an outputstream for appending to it.
+	 * @param path A file path in normalised format, relative to the mount location. ie: "programs/myprogram"
+	 * @return a stream for writing to
+	 */
+	public OutputStream openForAppend( String path ) throws IOException;
+
+	/**
+	 * Get the ammount of free space on the mount, in bytes. You should decrease this value as the user writes to the mount, and write operations should fail once it reaches zero.
+	 * @return The ammount of free space, in bytes.
+	 */
+	public long getRemainingSpace() throws IOException;
+}

src/main/java/dan200/computercraft/api/filesystem/package-info.java

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+/**
+ * This file is part of the public ComputerCraft API - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2016. This API may be redistributed unmodified and in full only.
+ * For help using the API, and posting your mods, visit the forums at computercraft.info.
+ */
+
+@API( owner="ComputerCraft", provides="ComputerCraft|API|FileSystem", apiVersion="${version}" )
+package dan200.computercraft.api.filesystem;
+
+import net.minecraftforge.fml.common.API;