Add commit hash and date to title screen

The commit hash and date are now shown above the version number in the
bottom-right of the title screen. They both automatically go away when
compiled in release mode.

https://cdn.discordapp.com/attachments/717089363896434719/779525976689213480/vvvvvv_with_interim_commit_and_date.png

This is useful to easily figure out which commit someone is on whenever
they report an issue, without having to ask them to do `git show` or
whatever.

desktop_version/src/Render.cpp

@@ -40,6 +40,12 @@ void menurender()
         graphics.drawsprite((160 - 96) + 5 * 32, temp, 23, tr, tg, tb);
 #if defined(MAKEANDPLAY)
         graphics.Print(-1,temp+35,"     MAKE AND PLAY EDITION",tr, tg, tb, true);
+#endif
+#ifdef COMMIT_DATE
+        graphics.Print( 310 - (10*8), 210, COMMIT_DATE, tr/2, tg/2, tb/2);
+#endif
+#ifdef INTERIM_COMMIT
+        graphics.Print( 310 - (8*8), 220, INTERIM_COMMIT, tr/2, tg/2, tb/2);
 #endif
         graphics.Print( 310 - (4*8), 230, "v2.3", tr/2, tg/2, tb/2);