Include some features from RaspiStill.c in RaspiStillYUV.c

Include settings, long exposure and different wait methodes.
Add burst mode to raspistill/raspiyuv and settings and long exposure to raspivid

Set burst mode before first capture and force dynamic frame rate to fulfil shutter speed requirement.
Merge pull request #191 from ethanol100/updateAndBurstMode

Update of RaspiStillYUV.c and burst mode