New Sound Browser

Recoded the sound browser:
- Fixes https://github.com/wiremod/wire/issues/229 and a lot of other bugs.
- It's much faster.
- Has new features.

Removed addon.txt, because it isn't needed any more.
(http://garrysmod.com/post/44073908112/gmod-update-158)

Pictures: (ignore the "favorites" spelling mistake, it's fixed)
![sb4](https://f.cloud.github.com/assets/2457653/321195/3ce57414-99a0-11e2-8545-44a342cae374.png)
![sb3](https://f.cloud.github.com/assets/2457653/321196/3cf8c118-99a0-11e2-95df-6c970f9dd1d9.png)
![sb1](https://f.cloud.github.com/assets/2457653/321197/3d0553ba-99a0-11e2-8d92-6ebd04b139ae.png)
![sb2](https://f.cloud.github.com/assets/2457653/321199/3d17e25a-99a0-11e2-81e8-e249c89dfc88.png)

Format of it's favourite lists: (ignore the German stuff)
![sb5](https://f.cloud.github.com/assets/2457653/321198/3d1ad8e8-99a0-11e2-98ac-f765624d3424.png)