Add support for Android 2.3+

There have been plenty of ppl involved in creating this version.
I don't wanna mention names as I'm sure I'd forget someone so I
just tell where help has been done:
- The partial android versions done by various ppl
- Testing on different android devices
- reviewing code (especially the in core changes)
- testing controls
- reviewing texts

A big thank you to everyone helping this to be completed!

src/drawscene.cpp

@@ -427,6 +427,13 @@ void draw_scene(video::IVideoDriver* driver, scene::ISceneManager* smgr,
 		bool draw_crosshair = ((player->hud_flags & HUD_FLAG_CROSSHAIR_VISIBLE) &&
 				(camera.getCameraMode() != CAMERA_MODE_THIRD_FRONT));
 
+#ifdef HAVE_TOUCHSCREENGUI
+		try {
+			draw_crosshair = !g_settings->getBool("touchtarget");
+		}
+		catch(SettingNotFoundException) {}
+#endif
+
 		std::string draw_mode = g_settings->get("3d_mode");
 
 		smgr->drawAll();