Some refactors (see description)

- Renamed macro gen_time to GEN_TIME
- Moved scanner and editor to their own headers, I'm going to consider them extensions.
- I'm preparing to setup the library to build on multiple compiler platforms: clang, gcc, msvc.

.vscode/settings.json

@@ -25,4 +25,4 @@
 	"C_Cpp.errorSquiggles": "enabled",
 	"godot_tools.scene_file_config": "",
 	"C_Cpp.default.compilerPath": "cl.exe"
-}
+}