[FEAT]: Add command to change server URL, delete drives and clear history

[gamemaker1]

Is your feature request related to a problem? Please describe.
When running the server on my machine, the server keeps using a different port number every time. It would be easy for me to change the server URL using a command instead of editing the config file manually.

Describe the solution you'd like
Add a config command that allows you to edit the server URL, delete drives and delete command history. Example usage:

$ config set serverUrl "http://localhost:23983"
$ config del history
$ config del drives.c

[gamemaker1]

Note that I can make the server run on a fixed port by setting the PORT environment variable through terminal (env PORT=8000 /path/to/file), but some may prefer running it by double clicking it in file manager.

[gamemaker1]

Closed by commit 4e2baff (adds config command)