This pull request fixes an issue where the paint and erase tools in the TileMap editor had the same shortcut (E). The erase tool having "E" be its shortcut makes more sense than the paint tool having that be its shortcut. So I changed the paint tool's shortcut to be "D" since nothing else uses it and it's short for "draw", it's also right next to "S" on the keyboard which happens to be the selection tool.
* Added a new macro SNAME() that constructs and caches a local stringname.
* Subsequent usages use the cached version.
* Since these use a global static variable, a second refcounter of static usages need to be kept for cleanup time.
* Replaced all theme usages by this new macro.
* Replace all signal emission usages by this new macro.
* Replace all call_deferred usages by this new macro.
This is part of ongoing work to optimize GUI and the editor.
- Move most properties from TileMap to TileSet,
- Make TileSet more flexible, supporting more feature (several
collision layers, etc...),
- Fusion both the TileMap and TileSet editor,
- Implement TileSetSources, and thus a new way to index tiles in the TileSet,
- Rework the TileSet and TileMap editors completely,
- Implement an editor zoom widget (and use it in several places)
