[Spells] Updates to spell field 'cast not stands' to ignore casting restrictions (#1938)

* test

* complete

* Update effects.cpp

* Update spells.cpp

* Update effects.cpp

* [Spells] Support for bards using Disciplines while casting or /melody.

Support for spell field 'cast not standing' not allow casting from divine aura

* [Spells] Support for bards using Disciplines while casting or /melody.

DA bypass logic for spells with field 'cast_not_standing'

* updates

* stun and mez bypass

* Update spdat.cpp

* Update spdat.cpp

* Update spells.cpp

common/spdat.cpp

@@ -1671,3 +1671,15 @@ bool CastRestrictedSpell(int spellid)
 			return false;
 	}
 }
+
+bool IgnoreCastingRestriction(int32 spell_id) {
+	/*
+		field 'cast_not_standing' allows casting when sitting, stunned, mezed, Divine Aura, through SPA 343 Interrupt casting
+		Likely also allows for casting while feared, but need to confirm. Possibly also while charmed.
+		This field also allows for damage to ignore DA immunity.
+	*/
+	if (spells[spell_id].cast_not_standing) {
+		return true;
+	}
+	return false;
+}