[Ground Spawns] Convert Ground Spawns to Repositories (#3967)

# Notes
- Convert `LoadGroundSpawns()` to repositories.

zone/zone.cpp

@@ -349,7 +349,7 @@ bool Zone::IsSpecialBindLocation(const glm::vec4& location)
 
 //this also just loads into entity_list, not really into zone
 bool Zone::LoadGroundSpawns() {
-	Ground_Spawns groundspawn;
+	GroundSpawns groundspawn;
 
 	memset(&groundspawn, 0, sizeof(groundspawn));
 	int gsindex=0;