Adding new mob Lava Slime

Adding this new tough mob after a long time [REQ]/[CPT]/[DIS]/[WIP]/[FND]/[RC]...

It only has slighly more HP than 4,000 but a really tough defense and luck.

If you are wondering about the fixed EXP: the server would calculate over 15,000 EXP because of the high defense and LUK, so I entered a fix amount of EXP that fits better.

If you are wondering about the dMotion value of only 100: Slimes are slow and even though the Lava Slime is faster than other slimes, it is still slow. Since it's suppossed to be a hard mob I decreased dMotion so you can't freeze it in place, making it even more slower.

Drops are:
* Tiny Mana Elixir (825) 5%
* Coal (4001) 10%
* Pile of Ash (701) 10%
* Iron Ore (640) 10%
* Sulphur Powder (703) 25%
* Sling Bullet (904) 100%

Nothing special here.
Most items fit the vulcanic/mountainous topic.
Note that Tiny Mana Elixir is unreleased so far, only Medium is released (Illia Quest), but I kept a low drop chance.