REQ: create script to call the existing scripts

[mushis]

I wasn't aware that there was a script to update scripts.
And actually, there are 2: one is legacy (scripts.sh kept for compatibility only), and the other is the actual one (update_scripts.sh).

The point is, there are many scripts, 7 at this moment.

This request is to create a script that would call these scripts. This would:

• allow us to move all these scripts into a dedicated folder, which would make the folder appear more clean.
• show the options in a menu (the available scripts) when running this "master" script, with a description if it isn't obvious.
• allow to print "extra" instructions about how to use nquakesv
• improve UX of nQuakesv, and allow future improvements. This would help noob server admins.

By running this new "master" script, the user would be shown something like this:

nQuake server - QuakeWorld server
----------------------------------------
1) start servers
2) stop servers
3) show servers status
4) update scripts
5) update scripts (legacy)
6) update maps
7) update server binaries
Choose an option ( )