Add help message when attempting to load a script without arguments

[xerox8521]

This PR checks if no arguments were passed when attempting to (re-|un-)load a (filter-)script or gamemode and prints a help message instead of just failing to load the script.

[CLAassistant]

All committers have signed the CLA.

[AmyrAhmady]

formatting is not correct, please check clang format ci logs and fix it