Remaining issues / test points for AstGeneration integration

[JoshDreamland]

This is a list of items to verify before we can merge the AstGeneration branch into master. We should test on a variety of games, but in particular, these items are important:

• "Global local" variable access (e.g. inst.x + inst.y → glaccess(inst)->x + glaccess(inst)->y)
• Custom variable access (inst.foo → varaccess_foo(inst))
• With-statement scoping (implicit variable access for locals referenced in with() statements)
• Functions accepting enigma::varargs
• Function accepting enigma_this
• Use of event_inherited()
• Global and local variable declaration (global int some_global;, local int some_local;)
• Instance creation code (particularly without use of with_room_inst, which was used historically for code applying to deactivated instances)