Implement message splitting
Client side priority queueing and message splitting.
Asynchronous UDP connection, move connection reset variables to the proper place.
Toolbar support
Merge pull request #591 from kkotowick/server-side-modcontrol-upgrade

Server side modcontrol upgrade
Merge pull request #593 from godarklight/client-side-priority-splitting

Client side priority splitting
Merge pull request #594 from godarklight/toolbar-integration

Toolbar support, Fixes #507
Stop toolbar repeditively loading.
Merge pull request #614 from godarklight/fix-toolbar

Stop toolbar repeditively loading.
Improved server-side mod control, added options for non-SHA checked required and optional files. Fixed some bugs with the client SHA hashing of loaded files.