Merge branch '506-remove-recording-button' into 'master'

3rdparty

CMakeLists.txt

docs/source/user_interface/images/PlayerControl.png

docs/source/user_interface/user_interface.md

icons/icons.qrc

icons/record.png

icons/stop-record.png

src/IO/CMakeLists.txt

src/IO/aviFileWriter.cpp

src/IO/aviFileWriter.h

src/player.cpp

src/player.h