Replay gallery for renpy (Patreon)

This weekend I've finished the replay gallery, now it has an adjustable number of thumbnails per page, and unlocking system.
Right now the unlocking system works by the thumbnails present but inactive, however, changing it to hiding the thumbnails while locked is also possible with a small change in the code. Implementing both at the same time is also possible with some additional functions, but I'll write and add that update once one of you needs it or some other changes.
The code was giving me a little grief, turns out keeping my renpy launcher open for weeks causes some problem with variables or something. Luckily re-launching sorted everything out.