Map Editor state, change in tile texture location
	modified:   LibreSTR/MainMenu.cpp
	modified:   LibreSTR/MainMenu.h
	modified:   LibreSTR/NewGameMenu.cpp
	modified:   LibreSTR/NewGameMenu.h
	modified:   LibreSTR/gui/GameOverlay.cpp
	modified:   LibreSTR/gui/GameOverlay.h
	modified:   MapEditor/CMakeLists.txt
	new file:   MapEditor/EditItem.cpp
	new file:   MapEditor/EditItem.h
	new file:   MapEditor/MEMap.cpp
	new file:   MapEditor/MEMap.h
	new file:   MapEditor/METile.cpp
	new file:   MapEditor/METile.h
	modified:   MapEditor/MapEditMainMenu.cpp
	modified:   MapEditor/MapEditMainMenu.h
	new file:   MapEditor/MapEditState.cpp
	new file:   MapEditor/MapEditState.h
	new file:   MapEditor/MapItem.cpp
	new file:   MapEditor/MapItem.h
	modified:   MapEditor/NewMapState.cpp
	modified:   MapEditor/NewMapState.h
	modified:   STRData/FileSystem.h
	modified:   STRData/MapData.h
	modified:   assets/assets.def
	deleted:    assets/sprites/grass.spr
	deleted:    assets/sprites/rock.spr
	renamed:    assets/sprites/grass.png -> assets/sprites/tile/grass.png
	new file:   assets/sprites/tile/grass.spr
	new file:   assets/sprites/tile/none.png
	new file:   assets/sprites/tile/none.spr
	renamed:    assets/sprites/rock.png -> assets/sprites/tile/rock.png
	new file:   assets/sprites/tile/rock.spr