Camera Component, Editor Viewport Widget refactoring.

- Handle changing of active camera entirely inside CameraComponentController
- Remove a LOT of legacy Cry things related to cameras
- Add a CameraSystemComponent to handle ActiveCameraRequestBus and CameraSystemRequestBus

Signed-off-by: Yuriy Toporovskyy <toporovskyy.y@gmail.com>

Code/Legacy/CryCommon/ISystem.h

@@ -900,9 +900,6 @@ struct ISystem
     //   Retrieves access to XML utilities interface.
     virtual IXmlUtils* GetXmlUtils() = 0;
 
-    virtual void SetViewCamera(CCamera& Camera) = 0;
-    virtual CCamera& GetViewCamera() = 0;
-
     // Description:
     //   When ignore update sets to true, system will ignore and updates and render calls.
     virtual void IgnoreUpdates(bool bIgnore) = 0;