Improve the ATDome CSC as follows:

• Make it the real CSC, not just a simulator
• Update for XML changes in DM-17610
• Add a command for homing
• Reject attempts to move in azimuth or home while already homing
• Make the engineering commands that move individual doors safer (the usual commands that open or close both doors are always safe; they have internal sequencing) and add unit tests for them:
  • Reject attempts to move the main door unless the dropout door is fully open or fully closed
  • Reject attempts to move the dropout door unless the main door is fully open
• Rename the bin script to remove the "_simulator" suffix and add a unit test for it
• Take a first pass at supporting configuration. The real code will have to wait until we have a standard for this.