giving you support for up to 9 video sources (e.g. webcams,
or X11 grabbers, etc.) active at once, displaying thumbnails for
each of them in the main GUI window, and with the ability to switch
between them on the fly during a conversation.

The code also implements a 'Picture in Picture' feature,
allowing you to select any source as primary or secondary,
and move the PiP window by just dragging it with the mouse.

The window looks like this:
 ________________________________________________________________
|  ______   ______   ______   ______   ______   ______   ______  |
| | tn.1 | | tn.2 | | tn.3 | | tn.4 | | tn.5 | | tn.6 | | tn.7 | |
| |______| |______| |______| |______| |______| |______| |______| |
|  ______   ______   ______   ______   ______   ______   ______  |
| |______| |______| |______| |______| |______| |______| |______| |
|  _________________    __________________    _________________  |
| |                 |  |                  |  |                 | |
| |                 |  |                  |  |                 | |
| |                 |  |                  |  |                 | |
| |   remote video  |  |                  |  |   local video   | |
| |                 |  |                  |  |          ______ | |
| |                 |  |      keypad      |  |         |  PIP || |
| |                 |  |                  |  |         |______|| |
| |_________________|  |                  |  |_________________| |
|                      |                  |                      |
|                      |                  |                      |
|                      |__________________|                      |
|________________________________________________________________|



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@126480 65c4cc65-6c06-0410-ace0-fbb531ad65f3