Added extremely simple core test example.

tools/merger/test_core_1/compile_linux.sh

@@ -0,0 +1,8 @@
+
+ccache g++ -Wall -g -c sfw.cpp -o sfw.o
+ccache g++ -Wall  -g -c main.cpp -o main.o
+
+#-static-libgcc -static-libstdc++
+
+ccache g++ -Wall -lm -ldl -lpthread -lX11 -g sfw.o main.o -o game 
+

tools/merger/test_core_1/main.cpp

@@ -0,0 +1,47 @@
+
+#include "sfw.h"
+
+class GameApplication : public Application {
+	SFW_OBJECT(GameApplication, Application);
+
+public:
+	virtual void input_event(const Ref<InputEvent> &event) {}
+	virtual void update(float delta) {
+	    _font_pos.x += 500 * delta;
+	    if (_font_pos.x > 1800) {
+            _font_pos.x = 0;
+	    }
+	}
+	virtual void render() {
+		Renderer::get_singleton()->clear_screen(Color());
+		Renderer::get_singleton()->draw_text_2d("Test!", _font, _font_pos);
+	}
+
+	GameApplication() {
+		_font.instance();
+		_font->load_default(31.5);
+		_font_pos = Vector2(0, 500);
+
+		Renderer::initialize();
+	}
+
+	~GameApplication() {
+		Renderer::destroy();
+	}
+
+    Vector2 _font_pos;
+	Ref<Font> _font;
+};
+
+
+int main(int argc, char **argv) {
+	Application *application = memnew(GameApplication());
+
+	while (application->running) {
+		application->main_loop();
+	}
+
+	memdelete(application);
+
+	return 0;
+}