allow _ for panel custom menu comamnds that need spaces (like G0 X100 Y100 would be G1_X100_Y100)
allow | to separate commands to allow for multiple commands in custom menu
Allow each screen to determine its timeout value before returnign to watch screen
make custom menu and prepare timeouts much longer
allow button press in startup panel screen to go to main menu
Merge pull request #275 from wolfmanjm/upstreamedge

allow _ for panel custom menu comamnds that need spaces (like G0 X100 Y1...