ROM and Compression library updates

Remove Compress and Decompress from ROM
Move Editor parent class to its own file
Move 65816 editor constants to widgets
Update compression_test and snes_palette_test
Start version constant classes (experimental)
Move SetupROM for editors to load renderer

src/app/editor/master_editor.h

@@ -63,7 +63,6 @@ class MasterEditor {
   absl::Status prev_status_;
 
   std::shared_ptr<SDL_Renderer> sdl_renderer_;
-  std::shared_ptr<core::Editor> current_editor_;
 
   AssemblyEditor assembly_editor_;
   DungeonEditor dungeon_editor_;