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.

licenses/Unlicense.txt

@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>

licenses/license_links/SimpleLicense.tres

@@ -0,0 +1,14 @@
+[gd_resource type="Resource" script_class="LicenseLink" load_steps=3 format=3 uid="uid://d2b7iusbtenmi"]
+
+[ext_resource type="Script" path="res://addons/simplelicense/api/LicenseLink.gd" id="1_3or5k"]
+[ext_resource type="Script" path="res://addons/simplelicense/plugin.gd" id="1_qarv5"]
+
+[resource]
+script = ExtResource("1_3or5k")
+link_files = Array[Resource]([])
+link_dirs = Array[Resource]([ExtResource("1_qarv5")])
+link_paths = []
+componet_name = "Simple License"
+extra = ""
+license_identifier = "CC0-1.0"
+copyright = Array[String](["2023, GradyTheDev"])