Vim, KeymapSwitcher and UnRAR packages updated

* Version of Vim package for x86_64 added;
* Version of KeymapSwitcher package for x86_64 added;
* KeymapSwitcher package fixed to preserve Cmd <-> Ctrl swap settings on
  keymaps switch. Fixes #9142;
* UnRAR updated from 3.7.8 to 4.2.4, fixed for multibyte characters
  support and build for x86_64. Partially fixes #4879;
bin/unrar outsorced to UnRAR 4.2.4 opt.package