[Spells] Update to how Bard Instrument mods are applied to spell effects (#1628)

* new instrument mod spell effect checks

PR split

* format

* Update spdat.cpp

correction, all direct damage spells get modifiers. Made a mistake with the parse, was using wrong mod.

* restriction changes

cure effects can be modified.
decided to keep a list of known effects that are not modified to return false. and will keep the default to be true for anything as to not inhibit custom bard song development

* SE_ProcChance is modified

* Update spdat.cpp

* update

* Update spell_effects.cpp

common/spdat.h

@@ -1509,6 +1509,7 @@ bool IsCastWhileInvis(uint16 spell_id);
 bool IsEffectIgnoredInStacking(int spa);
 bool IsFocusLimit(int spa);
 bool SpellRequiresTarget(int targettype);
+bool IsInstrumentModAppliedToSpellEffect(int32 spell_id, int effect);
 
 int CalcPetHp(int levelb, int classb, int STA = 75);
 int GetSpellEffectDescNum(uint16 spell_id);