Add parametrized fake DIRC with support

compact/subsystem_views/README.mds

+# subsytem_views
+
+These compact detector files are copies of the main `athena.xml` compact description file, modified to only show certain subsystems.
+
+To add or update a subsystem:
+
+1. Copy `athena.xml` to this directory (`compact/subsystem_views`) with the appropriate name.
+2. Remove all the undesired detectors from this xml file. **Do not modify any of the included xml files** -- only modify the top level xml file here.
+3. Check that that you have the desired color scheme (eg. `colors.xml`) and display attributes (eg. `display_detailed.xml`) included.
+
+These compact detector files should not be used for any real simulations or studies.