[Spells] Update SPA 339 SE_TriggerOnCast (#1478)

* Recoded SE_TriggerOnCast Focus effect

Recoded SE_TriggerOnCast focus effect to be consistent with how all other focuses are checked. No longer an arbitrary limit as to number of a focus effects of this type you can have.

* new command: resetdisc_timer

usage: #resetdisc_timer [all | timer_id]

* syntax fixes

syntax improvements

* minor fix

changed numhits check

* Update spell_effects.cpp

* added better support for spell procs that don't require target.

* syntax

* Formatting and syntax tweaks

Co-authored-by: Akkadius <akkadius1@gmail.com>

common/spdat.cpp

@@ -1282,3 +1282,14 @@ const char* GetSpellName(uint16 spell_id)
     return spells[spell_id].name;
 }
 
+bool SpellRequiresTarget(int spell_id)
+{
+	if (spells[spell_id].targettype == ST_AEClientV1 ||
+		spells[spell_id].targettype == ST_Self ||
+		spells[spell_id].targettype == ST_AECaster ||
+		spells[spell_id].targettype == ST_Ring ||
+		spells[spell_id].targettype == ST_Beam) {
+		return false;
+	}
+	return true;
+}