Add music and sound effects to assets

[t-karcher]

For the intro, for jumping (four effects: high and low jump, both in normal mode and instant replay mode), for wall collision and for the start of the instant replay. Seven files in total. I'd rather use cc-licenced or own samples than the original ones for copyright reasons.

[ChrisOKay]

tried to extract most sounds from https://www.youtube.com/watch?v=kAhytZnvc5g - there was just a single jump sound in this one, so I got:

• theme
• jump
• jumpFail
• instantReplay
• a few replay jumps, but these seem to be generated by jump height & delta

I'll try to make modified sounds on this basis to avoid copyright issues.

[t-karcher]

Nice! We could also have a look at the sound effects available at opengameart.org/ , but creating own effects would be even more awesomer. :-D

[ChrisOKay]

I am on it. Feel free to veto anything you don't like (see e.g. e0792cc). I am working with a synthesizer right now and can change anything anytime.