Update based on carlosmn suggestions.

We say that you can link libgit2 "unmodified"... "without having to release
its source code". Clarify that you can modify libgit2 - but you must
release _its_ source code back - and you can link libgit2 without having
to release _your software's_ source code.

#6491: Sets oid_type on repos open with git_repository_open_bare

stash: update strarray usage

stash: partial stash specific files

`git_strarray_copy` is deprecated (and has been included in
`deprecated.h` for some time). It should not have remained in
the public `strarray.h`. Remove it.

Fix some warnings in main

clone: clean up options on failure

SHA256: more SHA256 support

Support the notion of a home directory separately from global configuration directory

 Define correct off64_t for AIX

#6422: handle dangling symbolic refs gracefully

Fixes issue #6156.

Signed-off-by: Sven Strickroth <email@cs-ware.de>

Fix build failure with -DEMBED_SSH_PATH

diff_file: Fix crash when freeing a patch representing an empty untracked file

Support OpenSSL 3 in dynamic loading mode

Add new PHP bindings project to language bindings section of README.md

Updates the README.md language binding section to reference a new
project providing PHP bindings at https://github.com/RogerGee/php-git2.

This prevents GIT_MMAP_VALIDATE from failing.
This also prevents git_diff_file_content__unload from attempting to free git_str__initstr.

The git included with xenial is ancient, and lacks sha256 support.

The longest path within a git repository is now a SHA256 format
packfile. Adjust our max length checking to match.