* Add support for reset all controls
	* Add support for showing detected v4l controls
	* Add sliders to adjust threshold filter level
	* Make sliders reflect min/max/step values
	* Use the newer V4L2 control functions
	* Update po files and exclude the gtk2 data file from it
	* drop gtk2 and legacy gtk3 support
	* Embed mutexes inside struct camera
	* Update README.md to reflect latest changes

Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>