[MERGE] bzr.exe: move builtin plugins out of library.zip to directory 'plugins'

[Alexander Belchenko]

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This patch finishes reorganization of built-in plugins support for bzr.exe
that I started before bzr 1.0.

In my past experiments I found that loading builtin plugins from library.zip
is slower than from filesystem, because library.zip itself very big
file (>10MB) with many files inside.

So I moved builtin plugins (launchpad and multiparent) to 'plugins' directory
that installed typically as C:\Program Files\Bazaar\plugins.
bzr.exe is always looking for plugins in this directory, *after* user
plugins directory (either $APPDATA\bazaar\2.0\plugins or $BZR_PLUGIN_PATH).

Also I disable looking for plugins in library.zip, therefore it should reduce
plugins search time as well.

Now builtin plugins resides in filesystem,
so user is able disable them, if needed.
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