Add a weapon enchantment blessing that will enchant a monster's weapon

by two points (either this or armor enchantment blessing can occur, with 5% rarity). Whether to-hit or to-damage is chosen is random. Split handling of weapon enchantment into enchant_weapon() for the generic item routines, and handle_enchant_weapon() for the player-specific routines. Furthermore, make enchant_weapon() and enchant_armour() more similar in terms of structure.

Also, in bless_follower(), store the blessing description and monster name in std::strings instead of const char*'s.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3839 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on March 23, 2008
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