Add button

Change three status as the following flow.
Recording & Playing at the same time. -> Play the result to see if echo
cancellation works. -> Stop playing result -> Recording & Playing at
the same time.
Add webrtc framework for testing echo cancellation
Change arch to 32 bit only for webRTC lib.
Add webRTC Manager
Recording & Playing at the same time.

For future testing echo cancellation to see if we can erase the
background music.
Add switch button for enable webRTC