- [x] Add to `BarrelTrackerWithFrame`
 - [ ] Add to `TrapEndcapTracker
 - [ ] Add to other tracking detectors

	modified:   CMakeLists.txt
	modified:   src/BarrelTrackerWithFrame_geo.cpp

	modified:   TrapEndcapTracker_geo.cpp

This allows for a frame to be defined as the subtraction of 2 trds.

- Implemented using SimpleDiskTracker

- Renamed the vertex and tracker barrel detectors
- Commented out endcap tracker
- Added more detailed to space frame construction.

	renamed:    src/SiVertexBarrel_geo.cpp -> src/BarrelTrackerWithFrame_geo.cpp
	modified:   src/CylinderTrackerBarrel_geo.cpp

	modified:   compact/display.xml

Fixed ce_GEM overlap

 - Added gem layer structure
 - Added support module and ability to change the module component TRD
 parameters from the default envelope values.

	modified:   compact/gem_tracker_endcap.xml
	modified:   src/TrapEndcapTracker_geo.cpp

 - CylinderTrackerBarrel_geo can be used to define detailed modules
 which are then placed in barrel array.
 - The modules are cylindrical segments of a tube.
	modified:   compact/definitions.xml
	modified:   compact/gem_tracker_endcap.xml
	new file:   compact/mm_tracker_barrel.xml
	modified:   reference_detector.xml
	new file:   src/CylinderTrackerBarrel_geo.cpp

 - Uses the TrapEndcapTracker geometry construction
 - Material thicknesses needs attention.

 - Vertex tracker endcaps are simple disk trackers.

	new file:   compact/B0_tracker.xml
	modified:   compact/definitions.xml
	modified:   reference_detector.xml
	new file:   src/ref_RectangularTracker_geo.cpp

 - The endcap and barrels were added.

Squashed commit from Marshall

	new file:   ci_GEM.xml
	new file:   compact/ci_GEM.xml
	new file:   compact/ci_HCAL.xml
	modified:   compact/definitions.xml
	modified:   compact/display.xml
	modified:   compact/materials.xml
	modified:   reference_detector.xml
	modified:   src/cb_CTD_Si.cpp
	new file:   src/ci_GEM.cpp
	new file:   src/ci_HCAL.cpp