Added support for single app mode

Added capability for client to keep a list of apps that are
available on the VM, maintain separate "favorites" list, add
direct home screen shortcuts, and launch directly into specific
apps on connections.
Abstracted out AppRTCActivity functions and created two child
activities, AppRTCInfoActivity and AppRTCVideoActivity, to allow
for multiple points of entry when connecting to the VM.

Co-commits:
android_external_svmp_eventserver
svmp-protocol-def
svmp-server
Make SSL encryption default

Set encryption type to default SSL/TLS instead of Unencrypted.
Added developer preference to toggle displaying encryption options
(default is off).