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/mod_example/licenses/license_links/mod_1_license_link.tres

@@ -0,0 +1,14 @@
+[gd_resource type="Resource" script_class="LicenseLink" load_steps=3 format=3 uid="uid://ch5muqo430mw"]
+
+[ext_resource type="Script" path="res://addons/simplelicense/mod_example/mod_1.gd" id="1_3n7mw"]
+[ext_resource type="Script" path="res://addons/simplelicense/api/LicenseLink.gd" id="1_gufc2"]
+
+[resource]
+script = ExtResource("1_gufc2")
+link_files = Array[Resource]([])
+link_dirs = Array[Resource]([ExtResource("1_3n7mw")])
+link_paths = []
+componet_name = "Mod 1"
+extra = "extra info shown in the comment section of the link text"
+license_identifier = "mod_1_license_identifier"
+copyright = Array[String](["copyright year, (comma) name, (comma) company name"])

addons/simplelicense/mod_example/licenses/mod_1_license_identifier.txt

@@ -0,0 +1,15 @@
+This is an example of the custom license terms for Mod_1
+
+So like
+
+MIT LICENSE TERMS
+...
+..
+.
+
+or
+
+CC0 1.0 LICENSE TERMS
+...
+..
+.