Allow a "custom" theme which can be set to dark or light basis and have the
three main colours set to any colour at all.

* just-one-list:
  Synthesize default option for custom value in button grid
  Support button grid for boolean field as well
  Force immediate loading so that the button values don't repaint
  Show SVG icons in button grid
  Only use local label if there isn't a custom one
  If there is only one list-single field, render as buttons

If there is only one (non-cancel) action and only one field and it's a
list-single then let the user just tap the option they want to continue instead
of choosing something and then tapping next.

It is not special in XMPP URIs

* action-buttons:
  Support custom actions defined by a special list-single

* onboarding:
  Start cheogram.com register on first setup if no other PSTNS/SMS gateway
  You need to sign up, no matter what for

Why have two things that do the same job?  And Shapeable is better, works for
animations etc

Use the custom actions instead of the ones from <actions> when present, set the
field to the value and use action=execute when tapped.

* save-as-sticker:
  Allow saving inline images as sticker by long press
  Allow changing sticker directory
  Context menu item to save an image as a sticker

Easily save into sticker pack folders for easy sharing or use with a sticker
board app.

If a table has too many columns then showing them all next to each other is
awful and squishy.  So instead, when too wide based on current screen size, show
as a list of cards.  The cards are themselves a grid of two columns so that they
aren't too giantly tall, and they re-use the result field rendering for each
field in that card.

Changes on redraw such that rotating to landscape can take you to table view and
rotating back to portrait can take you back to list of cards.

Rather than wait for the user to find the setting.

So the conversation and the counterpart are both represented.

This reverts commit 8456f5004541e92c627e12d9fda21f5a04988dec.