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

libsrc/hyperion/schema/schema-grabberV4L2.json

@@ -46,8 +46,8 @@
 			{
 				"type" : "integer",
 				"title" : "edt_conf_v4l2_width_title",
-				"minimum" : -1,
-				"default" : -1,
+				"minimum" : 0,
+				"default" : 0,
 				"append" : "edt_append_pixel",
 				"propertyOrder" : 5
 			},
@@ -55,8 +55,8 @@
 			{
 				"type" : "integer",
 				"title" : "edt_conf_v4l2_height_title",
-				"minimum" : -1,
-				"default" : -1,
+				"minimum" : 0,
+				"default" : 0,
 				"append" : "edt_append_pixel",
 				"propertyOrder" : 6
 			},