libgit2's current default oid type is SHA1, set a public macro for that.

`git_oid`s now have a type, and we require the oid type when creating
the object id from creation functions.

Provide helper functions to provide information about the object id size
given its type.

We require an enumeration to help us identify the different types of
object IDs.  Currently, we only support SHA1 but we will support SHA256
in the future.

Callers should not assume the layout of the oid structure; provide them
a macro that defines the null / zero sha1 object id.

In preparation for SHA256 support, `GIT_OID_RAWSZ` and `GIT_OID_HEXSZ`
need to indicate that they're the size of _SHA1_ OIDs.

repo: allow administrator to own the configuration

status: update documentation for default options

config: update config entry iteration lifecycle

Update our ownership checks that were introduced in libgit2 v1.4.3
(to combat CVE 2022-24765). These were not compatible with git's; git
itself allows administrators to own the path. Our checks now match
this behavior.

Look for `getentropy` and flag its existence.

transport: introduce `git_transport_smart_remote_connect_options`

Snuck in during refactoring; let's get rid of it.

A couple of simplications around mwindow

Add a .clang-format with our style

Co-authored-by: Edward Thomson <ethomson@github.com>

CLI: progress updates

refs: fix missing error message

docs: fix couple of typos

revparse: Remove error-prone, redundant test

midx: do not verify the checksum on load

Avoid too much flashing on the console with updates about throughput.
Only update throughput once a second.

Include test results data in CI

midx: fix large offset table check.

Add link to Tcl bindings for libgit2

chore(docs): Add Pharo to language bindings

Though both are correct, this makes it clear that we're dealing with
the same value.