Add Buff infrastructure to go through different logic paths from different patches (#5073)

common/patches/titanium_structs.h

@@ -406,7 +406,7 @@ struct NewZone_Struct {
 */
 struct MemorizeSpell_Struct {
 uint32 slot;     // Spot in the spell book/memorized slot
-uint32 spell_id; // Spell id (200 or c8 is minor healing, etc)
+int32  spell_id; // Spell id (200 or c8 is minor healing, etc)
 uint32 scribing; // 1 if memorizing a spell, set to 0 if scribing to book, 2 if un-memming
 uint32 reduction; // lowers reuse
 };
@@ -442,7 +442,7 @@ struct ManaChange_Struct
 {
 /*00*/	uint32	new_mana;		// New Mana AMount
 /*04*/	uint32	stamina;
-/*08*/	uint32	spell_id;
+/*08*/	int32   spell_id;
 /*12*/	uint8	keepcasting;	// won't stop the cast. Change mana while casting?
 /*13*/	uint8	padding[3];		// client doesn't read it, garbage data seems like
 };
@@ -459,14 +459,14 @@ struct BeginCast_Struct
 {
 	// len = 8
 /*000*/	uint16	caster_id;
-/*002*/	uint16	spell_id;
+/*002*/	int16   spell_id;
 /*004*/	uint32	cast_time;		// in miliseconds
 };
 
 struct CastSpell_Struct
 {
 	uint32	slot;
-	uint32	spell_id;
+	int32   spell_id;
 	uint32	inventoryslot;  // slot for clicky item, 0xFFFF = normal cast
 	uint32	target_id;
 	uint8	cs_unknown[4];
@@ -495,7 +495,7 @@ struct SpellBuff_Struct
 /*001*/ uint8	level;
 /*002*/	uint8	bard_modifier;
 /*003*/	uint8	unknown003;		// MQ2 used to call this "damage shield" -- don't see client referencing it, so maybe server side DS type tracking?
-/*004*/	uint32	spellid;
+/*004*/	int32   spellid;
 /*008*/ int32	duration;
 /*012*/	uint32	counters;		// single book keeping value (counters, rune/vie)
 /*016*/	uint32	player_id;		// caster ID, pretty sure just zone ID
@@ -1142,7 +1142,7 @@ struct CombatDamage_Struct
 /* 00 */	uint16	target;
 /* 02 */	uint16	source;
 /* 04 */	uint8	type; //slashing, etc.  231 (0xE7) for spells, skill
-/* 05 */	uint16	spellid;
+/* 05 */	int16   spellid;
 /* 07 */	uint32	damage;
 /* 11 */	float force;
 /* 15 */	float hit_heading;	// see above notes in Action_Struct
@@ -1177,7 +1177,7 @@ struct Death_Struct
 /*004*/	uint32	killer_id;
 /*008*/	uint32	corpseid;	// was corpseid
 /*012*/	uint32	attack_skill;	// was type
-/*016*/	uint32	spell_id;
+/*016*/	int32   spell_id;
 /*020*/ uint32	bindzoneid;	//bindzoneid?
 /*024*/	uint32	damage;
 /*028*/	uint32	unknown028;
@@ -2233,7 +2233,7 @@ struct Resurrect_Struct	{
 	char	your_name[64];
 	uint32	unknown88;
 	char	rezzer_name[64];
-	uint32	spellid;
+	int32   spellid;
 	char	corpse_name[64];
 	uint32	action;
 /* 228 */
@@ -3247,7 +3247,7 @@ struct SendAA_Struct {
 /*0040*/	uint32 prereq_skill;		//is < 0, abs() is category #
 /*0044*/	uint32 prereq_minpoints; //min points in the prereq
 /*0048*/	uint32 type;
-/*0052*/	uint32 spellid;
+/*0052*/	int32  spellid;
 /*0056*/	uint32 spell_type;
 /*0060*/	uint32 spell_refresh;
 /*0064*/	uint32 classes;