To make the API documentation usable (again):

  - Rename to "FreeSWITCH API Documentation"

  - Remove all external INPUT paths, only scan FreeSWITCH core sources

  - Only parse a sane subset of files: *.c *.cc *.cpp *.h *.hh *.hxx
    (don't care about any python / whatever files for now)

  - Exclude modules (seriously, all the mod_java / mod_managed stuff
    turned it into an unusable mess. You need API docs of modules? Add separate doxygen
    configurations for them (or specific ones))

  - Include src/mod in example search path (for @include etc.), add C/C++
    patterns.

  - Set up PREDEFINED to fix the massive clusterf*ck that was caused by
    SWITCH_DECLARE() and friends.

<End Of Rant>
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

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