Add addon "Luanti Full API". Replaces #285

Author: alek13

.gitmodules

@@ -1,3 +1,7 @@
+[submodule "addons/luanti-full-api/module"]
+	path = addons/luanti-full-api/module
+	url = https://github.com/Voxrame/luanti-ide-helper.git
+
 [submodule "addons/busted/module"]
 	path = addons/busted/module
 	url = https://github.com/LuaCATS/busted.git

addons/luanti-full-api/info.json

@@ -0,0 +1,8 @@
+{
+  "$schema":
+    "https://raw.githubusercontent.com/LuaLS/LLS-Addons/main/schemas/addon_info.schema.json",
+  "name":
+    "Luanti Full API",
+  "description":
+    "All autocomletions and documentation for the Luanti Engine (formerly Minetest) Lua API"
+}