Project maintenance

* updated gitignore with *.meta, and sound files
	* Sounds won't be tracked with the repo, but will be distributed from the website
* Added sound sources and attributions
* deleted old unused scene
* renamed sounds for more relevance
* fixed missing camera script due to script being renamed
Changed dir structure to be more Unity-like
Updated changelog, readme. Minor scene chages.

Preparing for release!

Signed-off-by: Nickolaus D. Saint <nick@incendiarysoftware.com>