Christmas Update

Here's the changes for this update:

- Implemented key binding configuration
- Removed annoying scale effect from sliders

- Added Christmas content:
    * Santa hat
    * Reindeer horns
    * Gingerbread nipples
    * Gift box nipples
    * Rudolph nose

- Added 3 more scenes:
    * Forest small waterfall during daytime
    * Forest small waterfall during noon time
    * Forest small waterfall during night time

This background scene was suggested by a player, and I liked the idea so I included it for this update.
If you have more suggestions about content you'd like to see, let me know.
I hope you guys have a happy Christmas and a happy new year.

Cheers