commands: one grammar for !, merged commands, a settings sheet, two-level help

A `!` now means force or everything and nothing else (`:w!`, `:search!`,
`:export!`, `:logout!`). A command that did a second thing behind its bang
takes a word for it instead: `:space new|name|rm`, `:list name|rm`,
`:task [add]|edit`, `:upload seal`, `:import zip [/]`. `:card` while reading
a document makes a card about it, so `:card!` is gone.

Merged: `:export` downloads what has focus, a file as it is or a document as
markdown (`:download` folded in); `:share [off|new]` replaces `:unshare` and
`:link`, and the list's `s` and `y` give way to it and the info sheet;
`:noh` replaces `:clear`; `:vault [unlock|lock|passwd]` replaces `:unlock`,
`:lock` and `:passwd`; Esc in the list puts down what `m` picked up before it
closes the document, replacing `:unmark`.

The old spellings run as their new lines for one release through a table in
commands.ts; help and Tab leave them out, and the wiki lists them.

A settings sheet (`,` or `:settings`) holds the options, the vault, the
backup, the signed-in browsers, ssh keys and capture tokens. Each row runs
the command a line would. Bare `:set`, `:vault`, `:backup`, `:sessions`,
`:sshkey` and `:token` open it at their part.

`?` shows the keys and commands to start with, flagged in the keymap and the
command table; a second `?` (or `:help all`) shows all of them, and a filter
always searches all of them. Help rows are keyed by key and description, as
two contexts can share a label.

docs/wiki/Not-Losing-Things.md

@@ -36,7 +36,7 @@ restore can be undone the same way.
 
 ## The trash
 
-A delete is not final. `x`, `dd`, `:delete`, `:rmspace` and an `rm` over the
+A delete is not final. `x`, `dd`, `:delete`, `:space rm` and an `rm` over the
 mount put what they delete in the trash, with everything inside it.
 
 - `u` puts the last delete back where it was: the same folder, the same name,
@@ -75,8 +75,8 @@ sealed files opened.
 - `:import` picks a folder and uploads it into the one you are in. Directories
   become folders, `.md` and `.markdown` files become documents (named by their
   first heading), and anything else becomes a file.
-- `:import!` does the same with a zip.
-- `:import! /` pours an `:export!` back in at the root. Each directory becomes a
+- `:import zip` does the same with a zip.
+- `:import zip /` pours an `:export!` back in at the root. Each directory becomes a
   space again, or goes into the space already there by that name, and with
   `.workspace.json` the dates, names, boards and cards come back as they were.