Implement Linked Spell Reuse Timers

They started linked spells at OoW launch (I think)

At least canni was linked then.

This is rather user unfriendly, but that's live like.
Ex. the spells aren't actually put on cool down so you can attempt to cast them
still but you will be interrupted.

Titanium is particularly unfriendly with large differences in reuse times

common/eq_packet_structs.h

@@ -390,6 +390,18 @@ uint32 scribing;	// 1 if memorizing a spell, set to 0 if scribing to book, 2 if
 uint32 reduction;	// lower reuse
 };
 
+/*
+** Linked Spell Reuse Timer
+** Length: 12
+** Comes before the OP_Memorize
+** Live (maybe TDS steam) has an extra DWORD after timer_id
+*/
+struct LinkedSpellReuseTimer_Struct {
+	uint32 timer_id; // Timer ID of the spell
+	uint32 end_time; // timestamp of when it will be ready
+	uint32 start_time; // timestamp of when it started
+};
+
 /*
 ** Make Charmed Pet
 ** Length: 12 Bytes