early autumn clean-up (with added swearing)
- adding vim-shell,
- silence fucking easytags warning which is fucking annoying on Windows,
- make the helptag generator finally work,
- nvim can't fucking stop giving out about the settings it removed because fucking reasons; make it stop,
- make Win32 (g)vim use the same configuration as the POSIX-y one,
- update gitignore to match reality.