Cleanup of some lua code, initial work on encounter_quests

zone/lua_spell.cpp

@@ -3,4 +3,14 @@
 #include "../common/spdat.h"
 #include "lua_spell.h"
 
+#include "lua.hpp"
+#include <luabind/luabind.hpp>
+
+luabind::scope lua_register_spell() {
+	return luabind::class_<Lua_Spell>("Spell")
+		.def(luabind::constructor<>())
+		.property("null", &Lua_Spell::Null)
+		.property("valid", &Lua_Spell::Valid);
+}
+
 #endif