[crossfire] Obsolete flags

[Nicolas Weeger]

Hello.

There are quite many obsolete things in loader.l, so I'd like to remove'em, 
but not sure on some things. Also it'll require some map/arch cleaning.

First, those flags:
* has_ready_rod
* has_ready_horn
* has_ready_wand
mapped to FLAG_READY_RANGE
From what i read from the monster handling code, this ready_range flag is 
actually not required, it'll be calculated again. So IMO those three flags 
should be removed totally.

* can_use_wand mapped to FLAG_USE_RANGE

many archetypes use this flag, many in maps... So should be cleaned like 
crazy :)


* immune
* protected
* vulnerable
those kind of conflict with the resist_ values, they'll "override" or mess 
with them.
Unfortunately many (~400) maps still use those, so updating won't be easy.

* armour, which should be resist_physical, doesn't seem to be used much.

Any volunteers for helping to clean ? :)

Nicolas
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