BM Update 0.5.1

Update 0.5.1 is here,
there are no new scenes, but as promised, some fixes and a working gallery plus some extra content (unused images, render experiments with the game's characters, etc.).

Sadly I had to change a lot of the gallery code, so for some of of the scenes you'll have to restart the game to show in the gallery.
To see the special content, you'll have to finish the game (the current version), which unlocks the content in the gallery.

Changelog:

- fixed gallery
- added "special content"
- bug fixes
- reworked the main menu (it will also stay in place now when you use the font size and line spacing slider)
- fixed some minor errors in the new scenes
- re-rendered some older render
- probably some other stuff I already forgot...