skypiax: fixed crash when you set an interface as 'sk' console, then remove the interface, then use the 'sk' command to send a message to the API (it try to use a non-existing interface)

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@14411 d0543943-73ff-0310-b7d9-9358b9ac24b2

skypiax: patch from Seven Du for hunting IDLE channels in a round-robin way (RR interface vs ANY interface). patch from Seven Du for removing interface as #'interface_id' and #'interface_name'. gmaruzz (meh) patch interface_remove() not to alter the global 'running' variable (it would cause all running signaling and API thread to exit) but to use a newly added tech_pvt->running variable. Also, changed behavior of interface_exists() for correct identification when using #interface_name and #interface_id. PLEASE TEST IT HEAVILY

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git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@14392 d0543943-73ff-0310-b7d9-9358b9ac24b2

mod_voicemail: allow Voicemail FF REW key to have configurable millisec interval AND allow REW to limit at the begining of the recording. (MODAPP-311)

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skypiax: indent -gnu -ts4 -br -brs -cdw -lp -ce -nbfda -npcs -nprs -npsl -nbbo -saf -sai -saw -cs -bbo -nhnl -nut -sob -l90

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skypiax: manage the 'WAITING_REDIAL_COMMAND' call status message (skypeout: remote PSTN party has rejected us, our outbound call is failed)

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skypiax: manage the 'BUSY' call status message (skypeout: remote PSTN party is busy, our outbound call is failed)

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skypiax: let's drain the audiopipe to empty, each time we read from it. This avoid accumulation of unread samples in the pipe buffer (was cause of delays?). Anyway, now latency is lower. Let's check if it breaks on windoz

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