[MERGE] Support for tbzr c++ implemented shell extension

[Alexander Belchenko]

Mark, I'm about of announcing new plugin for managing set of branches as complex project.
I think it's possible to describe all bzr.exe dependencies as components of complex project,
and factor out build scripts (including Inno Setup one) into separate component.
This way you should have more freedom in changing build scripts without affecting bzr.dev
at all. Although, keeping everything in one basket is very simple decision, but when I first
bring tools/win32/* into bzr.dev it was very hard decision for me. In the past there was
no way to manage complex projects. In the near future I hope this will be possible at least.
Do you want to test this idea?

Mark Hammond пишет:
> Tortoise has recently pushed a C++ implementation of the Shell Extension
> which is able to fully replace the current Python implemented one.
> Advantages include 64bit support and reduction in overhead for processes
> which drag in shell extensions.
> 
> The attached patch modifies setup.py and bzr.iss.cog accordingly.
> 
> Cheers,
> 
> Mark
>