[bugfix] tf display: hide tf nodes with failes transforms
added overrideROSTime to vis manager
cleaned up time panel
nicer color property layout
initial sync signal implementation
time panel: corrected spelling in slot defs
time panel: implemented time signal handling
modified InteractiveMarker to support time-sync
Camera Display: hide image on error, check for correct timesync time stamp
time panel: find entries by display, not by name
added emitTimeSignal to Display
visualization manager: replaced timeChanged with preUpdate signal
time panel: listen to preUpdate, replaced sync checkbox with dropdown menu
added approx. time support to camera display
time panel: implemented approx. time sync
moved all time handling to frame manager, added pause support to image/camera
time panel: disable sync source if sync-off
vis manager: call frameMgr->update after ros::spin
fixed sign error in approx. sync
Merge branch 'groovy-devel' into time_sync