SDLPP TextRenderer: add function

sdlpp/sdlpp_textrenderer.cpp

@@ -161,4 +161,7 @@ void TextRenderer::saveFontConfig(
     _config = std::move(config);
     text_change = true;
 }
+std::string TextRenderer::getText() {
+    return _text;
+}
 } // namespace SDLPP

sdlpp/sdlpp_textrenderer.hpp

@@ -39,6 +39,7 @@ public:
     virtual void render() override;
     virtual void updateSizeAndPosition() override;
     virtual std::shared_ptr< RenderObject > copySelf() override;
+    std::string getText();
 
 private:
     virtual void copyTo( std::shared_ptr< RenderObject > other ) override;