ASMAPI.getSystemPropertyFlag using wrong Boolean conversion

[jediminer543]

As of writing; the ability for coremods to access properties is broken due to the method of boolean conversion.

It currently uses Boolean.getBoolean which reads the given string as a property name and the looks at what the value of that property is. To make a flag "flag" be true pass `-Dcoremod.flag=true -Dtrue=true'

Responsible line:

CoreMods/src/main/java/net/minecraftforge/coremod/api/ASMAPI.java

Line 55 in 3817658

return Boolean.getBoolean(System.getProperty("coremod."+propertyName, "TRUE"));

[jediminer543]

Also as a request, as the current behaviour is that any flag that isn't "defined" (in the current wierd way) is to let it be false can this behaviour be preserved, instead of the presumably current aim of making it be true unless falsified

[PaintNinja]

Fixed by #41