Add MuOfficeLib functions to safely run native MuPDF ops.

It seems likely that we'll want people to able to use the MuPDF
C API as well as the MuOfficeLib helper lib. We therefore need
a way to get fz_context and fz_document values out of MuOfficeLib.

Potential problems exist with people calling MuPDF C API functions
using an fz_context that is in use elsewhere. Similarly, if an
fz_document is in use in a background thread (for instance in a
page render), we need to ensure that it can't be used at the same
time elsewhere.

We therefore provide MuOffice{Lib,Doc,Page}_run functions that
allow this to happen safely. This largely insulates callers from the
complexities of having to clone contexts etc, it safely ensures
that exceptions cannot be propogated beyond the topmost fz_try/
fz_catch, and it ensures that appropriate locking is used.

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