Major clean up and reorganization

- Upgraded to Godot 4
- Just remembered the basic principles are based on a tile editor, and dramatically simplified from there. Derp.
- New state machine and license display add-ons.
- Re-licensed under the GPL because Micropolis' assets aren't under a separate one.

addons/simplelicense/README.txt

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+A simple plugin, to make dealing with licensing simple.
+Files: ./addons/simplelicense/*
+License: CC0-1.0
+
+Developed in Godot version: v4.0.beta.custom_build [166df0896]
+
+Quick Example: (A License Viewer Scene, that you can also drop into one of your game scenes)
+	Run the Scene at
+	res://addons/simplelicense/GUI/LicenseGUI.tscn
+	
+	look around, then
+	click on the "open data directory" button
+	then click on the "save licenses" button
+	and watch the data directory populate with license files
+
+
+Quick Start:
+	1. Create a "LicenseLink" Resource file inside the
+		res://licenses/license_links/
+
+	2. Click on the the new Resource file, and try it out
+		There are docs on how to use it, so just F1 + LicenseLink, to find out more
+
+	3. Load license information
+		Create an instance of "LicenseManager" either in code or by adding the node to the scene
+		then call "load_license_information" on the LicenseManager
+
+	4. Export License information
+		call "export" function on the LicenseManager
+		it will populate the "user://" directory with your license files
+		one combined "COPYRIGHT.txt" file
+		and individual copyright files into "user://licenses/<license_identifier>.txt".
+		The license text will be formatted in the SPDX standard.
+		It's the way the Godot Engine does it.
+		 in the Godot Editor: Help -> About Godot -> Third-party Licenses
+		There is more you can do, just visit the docs!
+		(Like support for loading mod's license information!)