Implement cast_not_standing and fix Cazic Touch

No idea why this spell field does this, but that's what the client
is doing with it ...

zone/spell_effects.cpp

@@ -3660,7 +3660,8 @@ void Mob::DoBuffTic(const Buffs_Struct &buff, int slot, Mob *caster)
 		}
 		case SE_InterruptCasting: {
 			if (IsCasting()) {
-				if (zone->random.Roll(spells[buff.spellid].base[i])) {
+				const auto &spell = spells[casting_spell_id];
+				if (!spell.cast_not_standing && zone->random.Roll(spells[buff.spellid].base[i])) {
 					InterruptSpell();
 				}
 			}