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>

Gems/Atom/Component/DebugCamera/Code/Include/Atom/Component/DebugCamera/CameraComponent.h

@@ -103,6 +103,7 @@ namespace AZ
             void SetOrthographic(bool orthographic) override;
             void SetOrthographicHalfWidth(float halfWidth) override;
             void MakeActiveView() override;
+            bool IsActiveView() override;
 
             // RPI::WindowContextNotificationBus overrides...
             void OnViewportResized(uint32_t width, uint32_t height) override;

Gems/Atom/Component/DebugCamera/Code/Source/CameraComponent.cpp

@@ -250,6 +250,11 @@ namespace AZ
             // do nothing
         }
 
+        bool CameraComponent::IsActiveView()
+        {
+            return false;
+        }
+
         void CameraComponent::OnViewportResized(uint32_t width, uint32_t height)
         {
             AZ_UNUSED(width)