Print stack traces/add logging messages in several places

This will hopefully make it easier to track down various issues which
might otherwise go unnoticed or provide little information.

The main areas modified are those that external APIs may provide values
for or interact with: various providers and ILuaObject/IPeripheral
implementations. However, we do also log in a couple of other places
which indicate a problem with this, or another, mod.

src/main/java/dan200/computercraft/ComputerCraft.java

@@ -609,7 +609,7 @@ public class ComputerCraft
             }
             catch( Exception e )
             {
-                // mod misbehaved, ignore it
+                Logger.error( "Peripheral provider " + peripheralProvider + " errored.", e );
             }
         }
         return null;
@@ -653,7 +653,7 @@ public class ComputerCraft
             }
             catch( Exception e )
             {
-                // mod misbehaved, ignore it
+                Logger.error( "Bundled redstone provider " + bundledRedstoneProvider + " errored.", e );
             }
         }
         return combinedSignal;
@@ -677,6 +677,7 @@ public class ComputerCraft
                 catch( Exception e )
                 {
                     // mod misbehaved, ignore it
+                    Logger.error( "Media provider " + mediaProvider + " errored.", e );
                 }
             }
             return null;