CDClient cleanup and optimization (#1023)

* CDClient cleanup and optimization

- Use static function to get table name
- Remove unused GetName function
- Replace above function with a static GetTableName function
- Remove verbose comments
- Remove verbose initializers
- Remove need to specify table name when getting a table by name
- Remove unused typedef for mac and linux

* Re-add unused table

Convert tables to singletons

- Convert all CDClient tables to singletons
- Move Singleton.h to dCommon
- Reduce header clutter in CDClientManager

dDatabase/Tables/CDZoneTableTable.cpp

@@ -53,14 +53,6 @@ CDZoneTableTable::CDZoneTableTable(void) {
 	tableData.finalize();
 }
 
-//! Destructor
-CDZoneTableTable::~CDZoneTableTable(void) {}
-
-//! Returns the table's name
-std::string CDZoneTableTable::GetName(void) const {
-	return "ZoneTable";
-}
-
 //! Queries the table with a zoneID to find.
 const CDZoneTable* CDZoneTableTable::Query(unsigned int zoneID) {
 	const auto& iter = m_Entries.find(zoneID);