Backport Loot reworked from TBC branch

[al3xc1985]

I don;t think that wotlk branch has the reworked loot part that was made in tbc part.

I hope @Grz3s will take a look at it soon.

We still have a lot of problems but once backported it will all be fine

Usefull info from AnoxXS:

potions are not yet their own refloot for us
but that doesnt do much
gems in old world we also dont have in grps yet
but these are minor things
most important is removing all the corrupted stuff from loot templates
so random mobs dont drop ores or stuff