Reworked the ThreadManager and ChannelThread. ChannelThread now
contains the shared resources as static properties instead of relying
on being a nested class of ThreadManager.
The detection of URLs has now also been placed in ChannelThread, so we
now enqueue whole messages.
* MiscUtils.cs: Version bump and small improvements.

* NyaaSpam.cs: Comment out Show for now, we'll see if it's missed by
  the users.