Cache manager: pre script option

[liudger]

Have a option to select a script to run before caching will start.
This would help to set the character in the right setting for caching.

So the script needs to run before each character is cached. So the manager should provide the script with which character is going to be cached so it can set the right setting for that character.

[jdrese]

Hello @liudger

I will try to add this.