Add test code for absoute times

Interrupts the transmitted path
Merge remote-tracking branch 'github/sbpl' into pvt_segment_mode
Add visualizer for platform_motion_msgs::Path
Remove unneeded generat_messages

no messages present and this was throwing an error
Fix standard flag for robot compiler
Parameterize and clean up Path visualizer
Merge remote-tracking branch 'origin/pvt_segment_mode' into sbpl
Removed spline interpolation

The SBPL lattice planner should produce paths that are
sufficiently "smooth" already