closes#1550 , mgdb/pkmdb throw unconverted files which need conversion;
move main file load conversion to a reusable method and have pkmeditor
call it on every load.
add skip argument to ignore the conversion check (ie if the file is
loaded from an undoubtedly same type source).
pkm editor, sav editor, menus, and a manager to glue the storage slots
together
decouples the pkm/sav editors from a static savefile reference.
improves dragdrop/click view/set/delete indication, hides unavailable
contextmenuitems, and fixes a few incorrect references. Box Subviewer
slots now have all the indication/events that the main save editor slots
have.
pls report behavior bugs 👍
