1.0.4 - GMS2 fixes

This small update is GMS2-only and addresses several compatibility issues introduced by the recent GMS2 updates:

• Fixes a compilation error related to function calls no longer being allowed as a for-loop initializer
  (i.e. for(func(); ...; ...) is now forbidden)
• Fixes a potential error related to built-in function real() now throwing an error if the number is invalid
  (TJSON already did a validation pass before calling it, but is now even more careful)
• The now-separate GMS2 version also makes better use of GMS2 language features (array literals, ternary operators)