SDLPP: Don't save textures before render

Since textures should only be manipulated in the main thread (as well
as rendering), let programmers deal with ensuring the texture is
available during rendercopy

sdlpp/sdlpp_renderobject.hpp

@@ -16,6 +16,7 @@ class SDLPPSCOPE RenderObject {
 public:
     RenderObject( const std::shared_ptr< Renderer > &r ) : renderer( r ) {}
     virtual ~RenderObject() {}
+    // TODO maybe do basic render() that all descandants can inherit?
     virtual void render() = 0;
     virtual int leftmost() = 0;
     virtual int topmost() = 0;
@@ -78,7 +79,6 @@ public:
     bool isStatic();
     void setStatic( bool stat = true );
     std::shared_ptr< Renderer > getRenderer() const;
-    void saveCurTexture();
 
 protected:
     virtual void copyTo( std::shared_ptr< RenderObject > other );