[crossfire] Skill subtypes/names

[Nicolas Weeger]

Hello.

Right now, one can't create 2 skills behaving similarly but with different 
names.

The reason is because there is a skill_names array, indexed by subtype. Thus 
there is a conflict when 2 skills have the same.

This array is used to quickly find skills objects, through eg SK_DISARM_TRAPS.

I'd like to remove this restriction (assuming it isn't too hard, but shouldn't 
be, most of the code doesn't rely on the array - appears a total of 17 times, 
including declaration, filling, and such).

This would mean splitting skills subtype number - hardcoded - and skills 
count - generated from archetype list.

Also, it could mean we'd be able to "merge" eg pyromancy / evocation / ...
(only need to fix IS_MANA_SPELL, or use 2 different subtypes, one for mana 
spells, one for grace spells).

Any objection?

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