Backport of MR !320 !319 !316, updates to the slow controls SDF to not constrain monitored PVs to a specific prefix
- Remove the prefix from the parsing of the req file.
- Add a target to build the sequencer to the cmake, for testing purposes.
- Updates the parsing of req and snap files to explicitly skip burt headers.
This is a back port (cherry pick) of commits that went into master.