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/CDRarityTableTable.cpp

@@ -33,14 +33,6 @@ CDRarityTableTable::CDRarityTableTable(void) {
 	tableData.finalize();
 }
 
-//! Destructor
-CDRarityTableTable::~CDRarityTableTable(void) {}
-
-//! Returns the table's name
-std::string CDRarityTableTable::GetName(void) const {
-	return "RarityTable";
-}
-
 //! Queries the table with a custom "where" clause
 std::vector<CDRarityTable> CDRarityTableTable::Query(std::function<bool(CDRarityTable)> predicate) {