[Expeditions] Decouple dz updates from expeditions (#1303)

Use internal dz messages to process duration and location changes

Add world DynamicZone class (later this will inherit from a base)

Add FindDynamicZoneByID to get dz from zone and world system caches

world/CMakeLists.txt

@@ -7,6 +7,7 @@ SET(world_sources
 	cliententry.cpp
 	clientlist.cpp
 	console.cpp
+	dynamic_zone.cpp
 	eql_config.cpp
 	eqemu_api_world_data_service.cpp
 	expedition.cpp
@@ -41,6 +42,7 @@ SET(world_headers
 	cliententry.h
 	clientlist.h
 	console.h
+	dynamic_zone.h
 	eql_config.h
 	eqemu_api_world_data_service.h
 	expedition.h