Added 2 methods to lua freeswitch.Dbh
`last_error()` Returns the error string from the last query or nil.
`clear_error()` clears the error string.

* commit '7c60be14':
  [core] add channel hold/unhold verbosity

Merge pull request #1048 in FS/freeswitch from ~ARON45/freeswitch:feature/FS-9716-expand-variables-for-mod_amqp-command to master

* commit 'f4321a28':
  FS-9716: [mod_amqp] Command profile expand params

* commit 'a8926317':
  FS-9514 add event on mod_callcenter when max-no-answer is triggered

* commit 'b182a0ce':
  FS-9516 refactor loopback agent on mod_callcenter and fix multiple minor issues

Expand command profile params "exchange-name, queue-name, binding_key"
This allows dynamic binding based on fs core-uuid (ie, ${core-uuid} ).

FS-9733 [mod_rayo] prevent bad tts format string from being generated when MRCP headers are not present

* commit '0fd6667f':
  [FS-9367] log session counts at channel state change

* commit '26999898':
  FS-9387 [libzrtp] bugfix for hash calculation of the auxiliary secret