Minning & herbing improvement

[snkl]

Since the realm broke 4 to 5 times the retail cap in terms of population, there's litteraly hundreds (if not more) players gathering those ressources in Outland. The result is a total starvation in all areas that asks to the players a non-blizzlike intensive farming that has absolutely no good reasons to exist.

Something needs to be done about this :

- Add dynamic respawns on herbs and minerals
- Improved density of herbs and minerals in all areas
- More minerals or herbs earned while gathering each entity
- Feel free to suggest something

Thanks !