[DF-1918] Now scene camera switches to camera, selected in scene.
[DF-185] Fixed bug, when virtual sizes was not recalculated until core::draw called
[DF-1918] Now camera switching can be done from sceneTree contex menu
[DF-1918] Added collision objects for camera. Added debug draw for cameras
[DF-185] Zero scale is not allowed for axis arrows
Merge branch 'development' of https://github.com/dava/dava.framework into development

Conflicts:
	Tools/ResourceEditor/ResourceEditorQtVS2010.vcxproj.filters