fix(api/win_get_config): include z-index

* Revert "tui: improve support for tmux, GNU Screen"

This reverts commit c266c2f36ea56220268d2b19364e28815e338c2f.

This commit broke neovim under tmux, where it "types" the background
string as input to the terminal. Fixing this with neovim as-is requires
changing tmux keybindings or TERM settings, which has to be done by
every single user, therefore a fix should happen on neovim's side.

Fixes #14298

* tui: fix code lints.

Problem:    The wininfo list may contain stale entries.
Solution:   When closing a window remove any other entry where the window
            pointer is NULL.
https://github.com/vim/vim/commit/4882d983397057ea91c584c5a54aaccf15016d18

Problem:    The "zy" command does not work well when 'virtualedit' is set to
            "block". (Johann Höchtl)
Solution:   Make endspaces zero. (Christian Brabandt, closes vim/vim#8468,
            closes vim/vim#8448)
https://github.com/vim/vim/commit/7d7bcc6ba01454c1cbb1dcbf5f11c3a4051535d6

N/A patches for version.c:

vim-patch:8.2.3075: xxd always reports an old version string

Problem:    Xxd always reports an old version string. (Åsmund Ervik)
Solution:   Update the version string with the last known change date.
            (Jürgen Weigert, closes vim/vim#8475)
https://github.com/vim/vim/commit/80b2ba3e9602e09ab523e78946fbb26da311b68b

fixup(ts): put ts_query_cursor_set_match_limit behind feature guard

This is a fixup for #14915, which used the above-mentioned call to
restore the behavior of the pre-release version of tree-sitter to
that of 0.19.5. However, this function was introduced after 0.19.5,
breaking distro builds that link against 0.19.5 instead of the tag
specified in neovim's build script.

Now the function should only be called when it is available _and_
needed. Once tree-sitter is bumped to 0.19.6 (when this is released),
this guard can be removed again.

Fixes #14923 (among others)

An assortment of various vim.opt fixups.

Extmarks: manually zero out `curbuf->deleted_bytes2` on substitute and join