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/CDItemComponentTable.cpp

@@ -74,14 +74,6 @@ CDItemComponentTable::CDItemComponentTable(void) {
 #endif
 }
 
-//! Destructor
-CDItemComponentTable::~CDItemComponentTable(void) {}
-
-//! Returns the table's name
-std::string CDItemComponentTable::GetName(void) const {
-	return "ItemComponent";
-}
-
 const CDItemComponent& CDItemComponentTable::GetItemComponentByID(unsigned int skillID) {
 	const auto& it = this->entries.find(skillID);
 	if (it != this->entries.end()) {