Add functionality to render a browser in renderable sky browser and add it in module

modules/skybrowser/include/renderableskybrowser.h

@@ -3,18 +3,81 @@
 
 #include <modules/base/rendering/renderableplane.h>
 #include <openspace/documentation/documentation.h>
+#include <modules/webbrowser/include/webrenderhandler.h>
+#include <openspace/properties/vector/vec2property.h>
+#include <openspace/properties/triggerproperty.h>
+
+#ifdef _MSC_VER
+#pragma warning (push)
+#pragma warning (disable : 4100)
+#endif // _MSC_VER
+
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-parameter"
+#endif // __clang__
+
+#include <include/cef_client.h>
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif // __clang__
+
+#ifdef _MSC_VER
+#pragma warning (pop)
+#endif // _MSC_VER
+
+namespace ghoul::opengl { class Texture; }
 
 namespace openspace::documentation { struct Documentation; }
 
 namespace openspace {
 
+    class BrowserInstance;
+    class RenderHandler;
+    class WebKeyboardHandler;
+
     class RenderableSkyBrowser : public RenderablePlane
     {
     public:
+        static constexpr const char* KeyIdentifier = "Identifier";
+
         RenderableSkyBrowser(const ghoul::Dictionary& dictionary);
         virtual ~RenderableSkyBrowser() = default;
 
+        void initializeGL() override;
+        void deinitializeGL() override;
+
+        void update(const UpdateData& data) override;
+
+    protected:
+
+        properties::Vec2Property _dimensions;
+        std::unique_ptr<BrowserInstance> _browserInstance;
+        std::unique_ptr<ghoul::opengl::Texture> _texture;
+
     private:
+        class ScreenSpaceRenderHandler : public WebRenderHandler {
+        public:
+            void draw() override;
+            void render() override;
+
+            void setTexture(GLuint t);
+        };
+
+        CefRefPtr<ScreenSpaceRenderHandler> _renderHandler;
+
+        void bindTexture() override;
+
+        properties::StringProperty _url;
+
+        properties::TriggerProperty _reload;
+
+        CefRefPtr<WebKeyboardHandler> _keyboardHandler;
+
+        glm::ivec2 _objectSize = glm::ivec2(0);
+        bool _isUrlDirty = false;
+        bool _isDimensionsDirty = false;
 
     };
 }