Allow selecting multiple scenes or scripts in "Quick Open ..." for opening

Created by: Calinou

The ability to select multiple scenes or scripts in "Quick Open Scene" and "Quick Open Script" would help increase productivity.

Use cases:

• Open all your scripts at once
• Open all the scripts in a folder (since the scripts are sorted by name, this is easy)
• Open just 2-3 scripts, without using the menu 2-3 times