Revert "add: Powder Toy addon (#129)" (#130)

This reverts commit b7bfb6f.

Author: carsakiller

.gitmodules

@@ -169,7 +169,3 @@
 [submodule "addons/umbrella/module"]
 	path = addons/umbrella/module
 	url = https://github.com/demiurgeQuantified/UmbrellaAddon.git
-[submodule "addons/powder-toy/module"]
-	path = addons/powder-toy/module
-	url = https://github.com/Maticzpl/TPT-LuaAPI-Addon.git
-	branch = publish