Add ability to specify a hiddenmenu timeout. Set timeout so it's unset in the case of hidden menu as you likely want to access a menu option not just have it timeout again.

git-svn-id: https://svn.code.sf.net/p/freeghost/code/trunk@2557 71f96598-fa45-0410-b640-bcd6f8691b32
Merge svn with dev-branch