Change spellMap property in pcgen.core.Globals to HashMap<String, Spell> as per old TODO entry. I couldn't find any indication that any lists are actually stored in this map, so this could be simplified.

git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@20408 ef53c05b-3124-4d59-ae7d-fe3273f42be7