add parallelism to sofia by offsetting sip messages to the concerned sessions and using multiple queue threads for message handling

add mutex around gateway access on per-profile basis and token based access to global profiles to prevent hanging on to the hash mutex while doing sql stmts which may cause issues/slowdowns

enable recursion for scoped variables so applications that exec more apps will preserve the scope, the most recent app will mask variables just during the duration of that app

add scoped channel variables (%[var=val,var2=val2] blocks valid in any app data field and will only last for that one app execution)

FS-3340 revert c5a2275f it breaks acking on session timers and initial invite