Update frame rate settings to work correctly with new fixes to
exposure in the firmware.
Merge pull request #148 from JamesH65/framerate_fixes

Update frame rate settings to work correctly
Changes for high frame rate modes and full FOV preview modes for stills
hello_pi: Update the texture coordinates to match latest firmware
See: https://github.com/raspberrypi/firmware/issues/256
Fix for two bugs
1. Bitrate needs to be set to 0 on OUTPUT port of encoder otherwise
it doesnt pick up the frame rate on its input port when connected
2. Filename incorrectly copied without terminator when set.
Merge pull request #154 from JamesH65/framerate_and_filename_fixes

Fix for two bugs
mmal: Add controls for manual AWB gains
mmal: Add controls for enabling SEI