Remove config option for debug API

And also remove the "is present" guards within the various APIs. I'm
happy at this point that debug is safe, and think we can guarantee its
presence.

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

@@ -36,7 +36,6 @@ public final class ComputerCraft
     public static int maximumFilesOpen = 128;
     public static boolean disableLua51Features = false;
     public static String defaultComputerSettings = "";
-    public static boolean debugEnable = true;
     public static boolean logComputerErrors = true;
     public static boolean commandRequireCreative = true;
 

src/main/java/dan200/computercraft/core/lua/CobaltLuaMachine.java

@@ -97,7 +97,7 @@ public CobaltLuaMachine( Computer computer, TimeoutState timeout )
         globals.load( state, new CoroutineLib() );
         globals.load( state, new Bit32Lib() );
         globals.load( state, new Utf8Lib() );
-        if( ComputerCraft.debugEnable ) globals.load( state, new DebugLib() );
+        globals.load( state, new DebugLib() );
 
         // Remove globals we don't want to expose
         globals.rawset( "collectgarbage", Constants.NIL );

src/main/java/dan200/computercraft/shared/Config.java

@@ -42,7 +42,6 @@ public final class Config
     private static final ConfigValue<Integer> maximumFilesOpen;
     private static final ConfigValue<Boolean> disableLua51Features;
     private static final ConfigValue<String> defaultComputerSettings;
-    private static final ConfigValue<Boolean> debugEnabled;
     private static final ConfigValue<Boolean> logComputerErrors;
     private static final ConfigValue<Boolean> commandRequireCreative;
 
@@ -120,10 +119,6 @@ private Config() {}
                     "autocompletion" )
                 .define( "default_computer_settings", ComputerCraft.defaultComputerSettings );
 
-            debugEnabled = builder
-                .comment( "Enable Lua's debug library. This is sandboxed to each computer, so is generally safe to be used by players." )
-                .define( "debug_enabled", ComputerCraft.debugEnable );
-
             logComputerErrors = builder
                 .comment( "Log exceptions thrown by peripherals and other Lua objects.\n" +
                     "This makes it easier for mod authors to debug problems, but may result in log spam should people use buggy methods." )
@@ -317,7 +312,6 @@ public static void sync()
         ComputerCraft.maximumFilesOpen = maximumFilesOpen.get();
         ComputerCraft.disableLua51Features = disableLua51Features.get();
         ComputerCraft.defaultComputerSettings = defaultComputerSettings.get();
-        ComputerCraft.debugEnable = debugEnabled.get();
         ComputerCraft.computerThreads = computerThreads.get();
         ComputerCraft.logComputerErrors = logComputerErrors.get();
         ComputerCraft.commandRequireCreative = commandRequireCreative.get();

src/main/resources/data/computercraft/lua/rom/modules/main/cc/expect.lua

@@ -51,10 +51,8 @@ local function expect(index, value, ...)
 
     -- If we can determine the function name with a high level of confidence, try to include it.
     local name
-    if native_type(debug) == "table" and native_type(debug.getinfo) == "function" then
-        local ok, info = pcall(debug.getinfo, 3, "nS")
-        if ok and info.name and info.name ~= "" and info.what ~= "C" then name = info.name end
-    end
+    local ok, info = pcall(debug.getinfo, 3, "nS")
+    if ok and info.name and info.name ~= "" and info.what ~= "C" then name = info.name end
 
     local type_names = get_type_names(...)
     if name then

src/main/resources/data/computercraft/lua/rom/modules/main/cc/pretty.lua

@@ -28,8 +28,7 @@ local expect = require "cc.expect"
 local expect, field = expect.expect, expect.field
 
 local type, getmetatable, setmetatable, colours, str_write, tostring = type, getmetatable, setmetatable, colours, write, tostring
-local debug_info = type(debug) == "table" and type(debug.getinfo) == "function" and debug.getinfo
-local debug_local = type(debug) == "table" and type(debug.getlocal) == "function" and debug.getlocal
+local debug_info, debug_local = debug.getinfo, debug.getlocal
 
 --- @{table.insert} alternative, but with the length stored inline.
 local function append(out, value)