Sdss-lvmecp

* Additional updates to documentation and testing.

* Add `LvmecpProxy` code as API using cluplus
* Update test code for LvmecpProxy
* Update sequence diagrams in docs

- update the commands "dome", "light" and "estop" which control elements of the LVM enclosure such as dome, control room light, and so on.
- update the commands "monitor" which will return the values of HVAC sensors.
- add the command "telemetry" which show users the status of all elements in the enclosure,
- unit test for the commands and actor.
- update the example section of sphinx docs.

- Initial version of the library and actor. Supports communication with the enclosure controller.
- added commands "dome" and "light" which has sub-commands "move" and "status".