Picture scrolling arrows are now bigger and flatter

From email: "Color game: make arrow for preview bigger and flatter."
Add sound effects to diff game

From email: Add sound to diff game
Re-organize Resources/Sound/ folder

- Background music is now located in BGM/
- Sounds are categorized by games they belong to
Remove obsolete song
Merge branch 'dev' into puzzle

Conflicts:
	Assets/Resources/Sound/_Music/Horse - Kevätlaulu.wav.meta