Extracts logic from the building & terrain & field item editors for reuse / separation of concerns
Have FieldItemEditor select between Items & Terrain so that you can change the popup menu mode (view set delete)
Not sure how I want to show the terrain names...
Setting a root tile: will fill in the extension tiles
Deleting a root tile: will delete all extension tiles (it assumes extension tiles are valid)
Add checkbox to prevent overwriting tiles that aren't none (eg if you set a 4x4 and it'd overlap with a 2x2, the program would play a sound indicating that the requested operation was disallowed).
Closes#136 -- multi-select with the current drawing setup isn't really feasible. Bulk set/delete addresses the underlying request.
Adds a transparency slider to have the field items fade so you can see the underlying terrain tile.
Not really optimized (allocates every time), but it should be fine for now.
Make the None item transparent, so that the entire map bleeds through (clear clarity).
jp/en/zh -- only english has been translated (duh)
keep in mind this translates the text in the program, not the internal flag names.
not sure if other languages need to be supported; from PKHeX's experience, only spanish is updated (besides jp/zh), as most users speak english or are fine using the program in english.
pls localize villager names and item names for non-english :P -- preferrably automated from raw game dumps
