* Extracts item comparison from Platform into their own helper.
Renamed methods to be more more fitting for the actual comparison.
Added documentation about each methods behaviour.
This is first update pass, which is mainly import reorganization, name
fixes, etc... Although some parts of second were done where changes
aren't important.
Errors: ~1400 -> 82.
Reduces the visibility of all fields to private and create setters/getters
when necessary. Exceptions are fields with GuiSync as these need to be
public.
Reduces the visibility of internal methods to private/protected/default when possible.