Feature request: include another file

[ZeroRin]

I'm currently writing some logics and noticed that I had to copy and paste a set of functions across different logic files. It's not so convenient and can be disastrous when I need to modify one of these functions (had to manually modify it in every file).

I wish we can have a sort of #include my_lib.mnd thing to make codes more reusable. as far as i'm concerned inserting the content of the target file into the position where #include happens should be good enough