`pck` [?] command

[tryoxiss]

I don't really know what this command should be called, but it would be nice to have a simple command that loads a PCK at runtime given a file path. It would be done with ProjectSettings.load_resource_pack(file), so it would be simple to implement.

~~Possibly res:// could be provided, so you just need to specify the file path within that.~~ It is actually reccommended you load mods from user://, so if we provide anything that should be it.

Sorry for posting two issues in a row, just some things I was thinking of.