Re #1762:
 - enumerate all capture devices
 - fast switch between capture devices
 - enhance simple renderer (a bit simpler, add capabilities)



git-svn-id: http://svn.pjsip.org/repos/pjproject@4824 74dad513-b988-da41-8d7b-12977e46ad98
Misc (re #1751): Fix crash when executing pattern matched shortcut on cli.



git-svn-id: http://svn.pjsip.org/repos/pjproject@4825 74dad513-b988-da41-8d7b-12977e46ad98
Misc (re #1751): Fix crash when retrieving dynamic choice(video stream info) caused by the use of invalid array index.



git-svn-id: http://svn.pjsip.org/repos/pjproject@4826 74dad513-b988-da41-8d7b-12977e46ad98