winhttp: name mangle class / iid on mingw

Export git_stash_apply_init_options

Fix typo

Fix a typo in documentation

Standard Windows type systems define CLSID_InternetSecurityManager
and IID_IInternetSecurityManager, but MinGW lacks these definitions.
As a result, we must hardcode these definitions ourselves.  However,
we should not use a public struct with those names, lest another
library do the same thing and consumers cannot link to both.

Make packfile_unpack_compressed a private API

Fix some issues with generated pkg-config file

ssh_stream_read(): fix possible *bytes_read < 0 branch

index: get rid of the locking

We don't support using an index object from multiple threads at the same
time, so the locking doesn't have any effect when following the
rules. If not following the rules, things are going to break down
anyway.

Handle dotfiles as the repo template dir and inside the template dir

Include dotfiles when copying template directory, which will handle
both a template directory itself that begins with a dotfile, and
any dotfiles inside the directory.

Ensure that we can handle template directories that begin with a
leading dot.

Ensure that `git_repository_init` honors the `init.templatedir`
configuration setting.

Update README URLs based on HTTP redirects

Fix a couple function signatures

Fix the possibility of returning successfully from ssh_stream_read()
with *bytes_read < 0. This would occur if stdout channel read resulted
in 0, and stderr channel read failed afterwards.

Fixed minor typo in README.md.

typos in comments

commit: Fix memory leak in test suite

Index fill: Small fixups

fix git_blob_create_fromchunks documentation

Note that we're not checking whether the resize succeeds; in OOM cases,
we let it run with a "small" vector and hash table and see if by chance
we can grow it dynamically as we insert the new entries. Nothing to
lose really.

merge: Use `git_index__fill` to populate the index

Instead of calling `git_index_add` in a loop, use the new
`git_index_fill` internal API to fill the index with the initial staged
entries.

The new `fill` helper assumes that all the entries will be unique and
valid, so it can append them at the end of the entries vector and only
sort it once at the end. It performs no validation checks.

This prevents the quadratic behavior caused by having to sort the
entries list once after every insertion.

putting `0.` at the start of the line turns it into a numbered list.