Work towards a cleaner replay.
wip
Caching icons in the MRA tree and also adding icon for markers.
Adding toolbar to switch on/off all replay layers.
Added replay layer for showing the plan.
Added Operational Limits replay layer.
 - Added LogReplayPanel plug-in type.
 - Separated the interface of LogReplayComponent and LogReplayLayer.
 - Added AttitudeReplayPanel plug-in
Removed LogReplay class.
Merging 'origin/feature/mrareplay-v2' into develop.