0.1.2

pqp desktop v0.1.2

Fullscreen works again.

ALLOWED_PERMISSIONS in the shell did not include "fullscreen". Chromium
delegates HTML fullscreen to the embedder as a permission, ours answered
false, and a denied request leaves the renderer promise pending forever:
no resolve, no reject, no fullscreenerror. Every fullscreen button in the
app was inert, and the client's error handling could not see it happen.

Also in this build, from the web client it loads:
- resharing a screen no longer shows black to everyone else
- each shared screen has its own fullscreen button when two people share
- camera and screen quality are selectable from the call, up to 4 Mbps