Grimoire cleric domain check

Development notes

 * updated sg_spellhook in bonus domain feat check section to only check cleric casters if local variable not set.
 * updated version of x2_mod_def_rest.nss added to hak for domain spell memorization and bonus domain feat checking
 * new function in sg_i0_deities: int SGCheckDomainSpellsMemorized(object oPC=OBJECT_SELF);
 * new function in sg_i0_spells: int SGGetHasClass(int iClassType, object oCreature=OBJECT_SELF);
 * new 2da created, sg_domains, which list spells domain requires. To be used in domain checking function.