config: fix included configs not refreshed more than once

Fix memory leak in git_smart__connect

git__timer: Limit ITimer usage to AmigaOS4

Consider files executable only if the user can execute them

Update from regex to pcre licensing information in docs/contributing.md

docs: fix some missing includes that cause Docurium to error out

Define WINHTTP_NO_CLIENT_CERT_CONTEXT if needed

docs: stop mentioning libgit2's "master" branch

Co-authored-by: lhchavez <lhchavez@lhchavez.com>

If an included config is refreshed twice, the second update is not taken
into account.

This is because the list of included files is cleared after re-reading
the new configuration, instead of being cleared before.

Fix it and add a test case to check for this bug.

The name of libgit2's main branch is now "main" but contributing.md and
release.md still reference "master" as the main branch.  Fix it.

This is what git.git does, so we should follow suit.

Tolerate readlink size less than st_size

Patch documentation

In https://github.com/libgit2/libgit2/pull/5723/files/fc46dc06f52f854f74371682f911f13856c68edb#r540092847, I was confused by the semantics of `git_index_find`. The documentation says both that it returns the output value in `at_pos` and that it returns it directly as an `int`. This is incorrect; the return value is only returned via `at_pos`.

The call to git_proxy_options_dup will replace the url pointer of the
proxy.
But if the url pointer is already set, the old address will be lost
forever and will never be free.

tests: clean up memory leak, fail on leak for win32

Fix issues with Proxy Authentication after httpclient refactor

Fix documentation formatting

Update README.md for additional Delphi bindings