* Add Support fo YUV420 and 410 and YVU variants.
* Add new formats to the help messaging
* Remove YUV410 supprt since M2M encoder on Pi cannot convert it
* Cleanups requested by @mdevaev
* Change to use u8 per @mdevaev
Extension of c96559e4ac.
Some cheap Chinise cameras produces frames which are detected as 'broken'. However they
are later handled well.
Introduce an option which allows disable the check on demand.