grabber api and feature unification (#462)

* move setvideomode to common place

* implement more croping and 3d support

* more api unification

* more refactoring

* osx fix

* next step

* add a mock for osx grabber. Now it is possible to test compile on none osx platforms.

* more unifications ...

* remove obsolete includes and grabbers are not dyn allocated. dispmanx needs rework an probaly not work atm

* first version of dispmanx mock. it compiles, but outputs a black image

* now dispmanx mock works!

* activate mocks in travis linux build
prepare dispmanx to rgb image out

* dispmanx now with image rgb output
fix deadlock with w/h -1 in grabber v4l
cleanups

* fix json

* fix some runtime stuff

* Update FramebufferWrapper.cpp

fix missing code

* unify grabframe

* 3d and croping for amlogic

* fix setimage not working

* make use of templates
save some codelines

* save more code lines

include/grabber/V4L2Grabber.h

@@ -10,11 +10,8 @@
 #include <QRectF>
 
 // util includes
-#include <utils/ColorRgb.h>
 #include <utils/PixelFormat.h>
 #include <hyperion/Grabber.h>
-
-// grabber includes
 #include <grabber/VideoStandard.h>
 
 /// Capture class for V4L2 devices
@@ -28,8 +25,8 @@ public:
 	V4L2Grabber(const QString & device,
 			int input,
 			VideoStandard videoStandard, PixelFormat pixelFormat,
-			int width,
-			int height,
+			unsigned width,
+			unsigned height,
 			int frameDecimation,
 			int horizontalPixelDecimation,
 			int verticalPixelDecimation
@@ -39,12 +36,9 @@ public:
 	QRectF getSignalDetectionOffset();
 	bool getSignalDetectionEnabled();
 
+	int grabFrame(Image<ColorRgb> &);
+		
 public slots:
-	void setCropping(int cropLeft,
-					 int cropRight,
-					 int cropTop,
-					 int cropBottom);
-
 	void setSignalThreshold(
 					double redSignalThreshold,
 					double greenSignalThreshold,