Rename Dispatch::{Dispatcher => Job_Queue}
Set default size of Dispatch::Job_Queue to 64
Implement a thread pool (Dispatch::Pool)
Fix typo
Move Dispatch::Job_Queue code to Dispatch.cpp
Make Dispatch::Job_Queue::m_size a public (read-only) attribute
Reorganize Dispatch::Job
Collapse Dispatch::Job_Ref's attributes into a single line