fix process interaction
- tsp: new event _deactivated: sent on switch
- tsp: new event _removed: sent on foreign remove
- tsp: new cmd _ack: acknowledges _deactivated/_removed
- tsp: new switch value 'hidden': switch to hidden app
- tsp: new apps are switched to (deact+act event)
- tkbio: dont init_screen on init, done on activate
- tkbio: new events _return_activate, _return_deactivate, _return_remove
- tkbio: _return_remove default action _return_quit
- tkbio: remove event _return_switch
- login: dont draw tiles on init
- menu: only set apps on init
- menu: use _return_deactivate for active status
- menu: use _return_system/menu for interception menu button
- slider: only set slider ticks/pos/name on init