convert everything to metatables and added rules

main/init.lua

@@ -0,0 +1,9 @@
+local _M = {
+    error_handling = require("main.error_handling"),
+    rules = require("main.rules"),
+    layouts = require("main.layouts"),
+    taglist = require("main.taglist"),
+    user_vars = require("main.user_vars"),
+}
+
+return _M