res/ari/resource_bridges: Add the ability to manipulate the video source

In multi-party bridges, Asterisk currently supports two video modes:
 * Follow the talker, in which the speaker with the most energy is shown
   to all participants but the speaker, and the speaker sees the
   previous video source
 * Explicitly set video sources, in which all participants see a locked
   video source

Prior to this patch, ARI had no ability to manipulate the video source.
This isn't important for two-party bridges, in which Asterisk merely
relays the video between the participants. However, in a multi-party
bridge, it can be advantageous to allow an external application to
manipulate the video source.

This patch provides two new routes to accomplish this:
(1) setVideoSource: POST /bridges/{bridgeId}/videoSource/{channelId}
    Sets a video source to an explicit channel
(2) clearVideoSource: DELETE /bridges/{bridgeId}/videoSource
    Removes any explicit video source, and sets the video mode to talk
    detection

ASTERISK-26595 #close

Change-Id: I98e455d5bffc08ea5e8d6b84ccaf063c714e6621

doc/appdocsxml.xslt

@@ -145,5 +145,25 @@
             </xsl:attribute>
             <para>Number of channels in the bridge</para>
         </xsl:element>
+        <xsl:element name="parameter">
+            <xsl:attribute name="name">
+                <xsl:value-of select="concat(@prefix, 'BridgeVideoSourceMode')" />
+            </xsl:attribute>
+            <enumlist>
+                <enum name="none"/>
+                <enum name="talker"/>
+                <enum name="single"/>
+            </enumlist>
+            <para>The video source mode for the bridge.</para>
+        </xsl:element>
+        <xsl:element name="parameter">
+            <xsl:attribute name="required">
+                false
+            </xsl:attribute>
+            <xsl:attribute name="name">
+                <xsl:value-of select="concat(@prefix, 'BridgeVideoSource')" />
+            </xsl:attribute>
+            <para>If there is a video source for the bridge, the unique ID of the channel that is the video source.</para>
+        </xsl:element>
     </xsl:template>
 </xsl:stylesheet>