.clang-format

resourceutil: don't limit resources to the `mercurial` package

This should make things a little clearer, in that it now requires the full
package name to access a resource.  But the real motivation is that
`extensions._disabledpaths()` walks the `hgext` directory looking for bundled
extensions.  This in turn feeds, among other things:

    1) Listing disabled extensions in `hg help extensions`
    2) Indicating that an unknown command is in a non-enabled extension
    3) Displaying help for non-enabled extensions
    4) Generating documentation
    5) Announcing LFS is auto-enabled (or not) when cloning from an LFS source

The filesystem based ResourceReader will happily return *.py and *.pyc, but the
one supplied by PyOxidizer doesn't.  Presumably we can change that.  The only
other idea I had here is for setup.py to generate a text file containing the
list of extensions, but that doesn't seem great when running from source.

Differential Revision: https://phab.mercurial-scm.org/D7772

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