Various widget constructor stubs and factories

Runtime/GuiSys/CGuiCamera.hpp

@@ -6,6 +6,21 @@
 namespace urde
 {
 
+class CGuiCamera : public CGuiWidget
+{
+public:
+    enum class Projection
+    {
+        Perspective,
+        Orthographic
+    };
+private:
+    Projection xf8_proj;
+public:
+    CGuiCamera(const CGuiWidgetParms& parms, float, float, float, float, float, float);
+    CGuiCamera(const CGuiWidgetParms& parms, float fov, float aspect, float znear, float zfar);
+    static CGuiCamera* Create(CGuiFrame* frame, CInputStream& in, bool flag);
+};
 
 }