fixed gui directory structure
added video test source, minor fix in ivideoplugin interface
implemented simple videoplayer(should be more advanced in the future;)
Corrected code style
Few fixes according to Marcin's code review.
improved videoplayer
added play and stop button
get_image method implemented in videotestsrc
fixed build error, added namespace, changes acording to code review, changed code styling in some places
changed names in test/telemetry_contorls/Battery.cpp
build fix
build fix
added IVideoSourcePlugin implementation in RtpClient
Merge branch 'master' of https://github.com/loganek/highflyers-gcs

Conflicts:
	src/video_streamer/VideoStreamer.cpp
	src/video_streamer/client/RtpClient.cpp
	src/video_streamer/include/video_streamer/VideoStreamer.h
	src/video_streamer/include/video_streamer/client/RtpClient.h
	src/video_streamer/include/video_streamer/server/RtpServer.h
	src/video_streamer/server/RtpServer.cpp
	test/telemetry_controls/Battery.cpp
build fix and minor styling changes