Extra default verbs added

1 for restart
2 for quit
Added sounds, backgrounds, welcome message,

Fixed random numbers
- Random number generator not generating from new seed

Added sounds
- Classes for notes and tunes
- Score increase and game over play sounds now
- Tunes are loaded from text files in Data/Sounds

Tweak borders
- Moved entire game area one character space to the right

Added backgrounds
- Mountains are drawn at the bottom of the stage behind the player and
obstacles

Fixed obstacles
- Now at least one height of obstacle from the top

Modified game over sequence
- Rewritten, more consistent behaviour
- Fixed new high score not displaying until a frame update

Renamed game title
- To Flappy Bird Text Game as it wasn't really a proper text adventure
game
Merge branch 'master' of https://github.com/Teh-Lemon/Flappy-Bird-Text-Adventure-game