Increase abstraction for arbitrary slot get/set operations, and fracture
SAV4 behavior for each game type.
Adds: Undo/Redo of party slot changes
Fixes: Fixed Gen5 daycare slot 2 reading, and EXP reading
Fixes: Some slot color glitchiness
Fixed: Box layout editor now hides the flag label if no flags are
present
Fixed: Gen7 box flags are now shown (unknown purpose lol)
Changed: savefile objects are generally smaller (removed a few shared
offset fields)
reference PKHeX.Core, main window loads assemblies & initializes
providing an ISaveProvider and the menustrip control (to insert controls
into)
pretty rough but should allow for inserting external control buttons &
allowing it to edit the UI a little
example: https://github.com/kwsch/PKHeXPluginExample
feedback is appreciated