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/CDObjectSkillsTable.cpp

@@ -33,14 +33,6 @@ CDObjectSkillsTable::CDObjectSkillsTable(void) {
 	tableData.finalize();
 }
 
-//! Destructor
-CDObjectSkillsTable::~CDObjectSkillsTable(void) {}
-
-//! Returns the table's name
-std::string CDObjectSkillsTable::GetName(void) const {
-	return "ObjectSkills";
-}
-
 //! Queries the table with a custom "where" clause
 std::vector<CDObjectSkills> CDObjectSkillsTable::Query(std::function<bool(CDObjectSkills)> predicate) {
 
@@ -55,4 +47,3 @@ std::vector<CDObjectSkills> CDObjectSkillsTable::Query(std::function<bool(CDObje
 std::vector<CDObjectSkills> CDObjectSkillsTable::GetEntries(void) const {
 	return this->entries;
 }
-