added font
closes #111
changed font of all important widgets of gui.ui and NewGameDialog.ui.
Reverted change to scanner that I accidently commited while fixing a merge conflict. (should be fixed anyway, but not here, to prevent merge conflicts later etc)
[Close #128] Stop camera scanning while doing board detection
[refs #131] Fixed bug where the painted debug image was used when doing board detection.
The problem was, that the global img0 Mat pointed to the same data as the camera_frame Mat in Scanner.cpp, which got modified in line 126 with paintedWarpedImg.copyTo(camera_frame);
closes #111
deleted old fonts, added new font and changed gui elements to new font
Merge pull request #120 from augmented-go/#111_change_font

#111 change font
Merge pull request #126 from augmented-go/#106_invalid_board_size_error_message

#106 invalid board size error message
Merge pull request #132 from augmented-go/#131_debug_image_board_detection

[refs #131] Fixed bug where the painted debug image was used when doing board detection.
Merge pull request #129 from augmented-go/#128_suspend_camera_scanning

[Close #128] Stop camera scanning while doing board detection
Merge remote-tracking branch 'remotes/origin/master' into Go_Scanner

Conflicts:
	Go_Scanner/detect_linies_intersections.cpp