fix: don't save undo history for :Shdo temp file

feat(icons): use virtual text if possible #255

docs: more extensions #247

fix(mappings): "." does not escape Vim special chars

fix: visual mappings only operate on a single selected file #245

feat: show error if directory is not readable

mappings: restore "q" mapping, soft-deprecate "gq"

fix(apply_icons): filename may be truncated #243

doc: tree-view mapping overwrites unnamed register

fix: spurious "Buffer would be deleted" warning

fix(mappings): "." on current directory

cleanup

fix(mappings): prefer <cmd>, drop <silent> #235

fix: no icons with g:dirvish_relative_paths

fix: :Shdo! on non-jagged path