Several option flags

[antonrogov]

• simple_headers (default false) - use a simple line instead of windows for headers. Header window didn't close for me occasionally and stick until vim is closed.
• force_if_includes (default true) - for some reason pushing to another remote branch (different name, not an upstream etc) with --force-with-lease didn't work for me if --force-if-includes was set. Also an option to opt out probably shouldn't hurt.
• log_view_esc_close (default true) - I'd like to keep things consistent and use the same "Close" binding for all buffers and also keep spamming esc in log view without it closing
• hard_reset_backup (default true) - ability to turn those commits off

[CKolkey]

I think some extra changes are sneaking in on accident because you are opening a PR from your master to mine - you could make a branch on your fork to be more selective about what changes are included here :)

[antonrogov]

Sorry, yes :) Added all the changes in one batch first and then split into this one, #1759 and #1758 (both from separate branches), but forgot one commit - removed and re-pushed. Also just realised it's not needed since there's neogit.action(..) already

[CKolkey]

No worries. I'll try to make some time to review this all soon ;)