refactor(init): export cache and update intervals

BREAKING CHANGE: lib will store cached export functions and no longer uses the : syntax to call functions.

Allow SetInterval to return arguments to the callback function.

resource/main.lua

@@ -1,9 +1,9 @@
 -- Creates exports from values assigned to lib
 -- Hacky workaround for Lua Language Server support
-
 --- Alias for `exports['pe-lualib']`
+
 lib = setmetatable({}, {
-	__newindex = function(self, name, fn)
+	__newindex = function(_, name, fn)
 		exports(name, fn)
 	end
 })