[MERGE] Various hackery to reduce startup time.

[Alexander Belchenko]

John Arbash Meinel пишет:
> So the biggest thing is bzrlib.user_encoding. I don't think we can get
> rid of it yet, and in general there isn't a win here for startup time,
> because we use it for command line processing. 

IMO, on Windows it's possible to use GetCommandLineW Win32 API to obtain unicode command line
without encoding it manually every time.