Achievement fixes and race ghost caching

I have just released version 1.03 which patches several bugs:

• When you quick-restart a race, or restart from the pause menu, or restart from results but without setting a new best time, ghosts are simply re-used instead of re-downloaded! This should generally make the game way less over-enthusiastic about constantly re-downloading the same ghosts over and over.

• many achievements are re-checked on the progress overview screen now

• the long-standing "bronze trophies seem to follow silver trophies" bug has been fixed!

• quick restart during the attract mode "exploit" (which was kinda cute but buggy) has been properly disabled now :)

As usual please let me know if you have issues with the game and I will do my best to address them! The best place to do this is on my discord