Beginnings of the "pass everything using a native type wrapper" console code.

- ConsoleValue class is now the base value class.
- ConsoleValueRef is now used to supply function parameters. Values are disposable.
- Script functions return values instead of just strings where possible.
- Variables can be disposable strings
- Bytecode changed

Fix the issues with console method parameters and fields which prevented missions from loading.

Engine/source/util/undo.cpp

@@ -566,7 +566,7 @@ ConsoleMethod( UndoManager, pushCompound, const char*, 2, 3, "( string name=\"\"
 {
    String name;
    if( argc > 2 )
-      name = argv[ 2 ];
+      name = (String)argv[ 2 ];
       
    CompoundUndoAction* action = object->pushCompound( name );
    if( !action )