contrib/win32/mercurial.iss

localrepo: move some vfs initialization out of __init__

In order to make repository types more dynamic, we'll need to move the
logic for determining repository behavior out of
localrepository.__init__ so we can influence behavior before the type
is instantiated.

This commit starts that process by moving working directory and .hg/
vfs initialization to our new standalone function for instantiating
local repositories.

Aside from API changes, behavior should be fully backwards compatible.

.. api::

   localrepository.__init__ now does less work and accepts new args

   Use ``hg.repository()``, ``localrepo.instance()``, or
   ``localrepo.makelocalrepository()`` to obtain a new local repository
   instance instead of calling the ``localrepository`` constructor
   directly.

Differential Revision: https://phab.mercurial-scm.org/D4564

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[Code]
procedure Touch(fn: String);
begin
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