Fix routing behavior of inbound calls from gateways that only match gateway based on the gw request uri param

we now honor the extension gateway param only if it is explicitly set, but will not route to the username param if extension is not set
also, new special value for extension "auto" that should use the request uri unless it has gw+ and then it will use the to uri

add temp_hold_music var that is only valid until you transfer the call and finishing touches on bind meta to A-D

add auto-jitterbuffer-msec param and auto-disable the jitterbuffer when briding to another channel who also has a jitterbuffer so both legs will disable during a bridge

Freetdm - ISDN:Fix for progress indicator not set properly. Allow state change from RINGING to PROGRESS