Zetta Com v1.3.1

A cosmetic fix. If you are already on 1.3.0 there is nothing here worth
reinstalling for — the application is byte-for-byte the same work, and only
the installer changed.

The installer carries the app icon

Every setup.exe up to now showed the stock NSIS icon, which is the first
impression the app makes — sitting in a Downloads folder before anyone has seen
the application at all.

Tauri only sets the installer and uninstaller icons when the configuration names
a file, and it named none, so the template left both empty and NSIS used its
default. They now point at the same icon the app itself uses, at six sizes from
16px to 256px, so it stays sharp wherever Explorer draws it.

The .msi is unchanged: Windows Installer packages always show the system
installer icon and there is no way to override it.

Everything from 1.3.0 is still here

If you are coming from 1.2.0 or earlier, the 1.3.0
notes are the ones
to read — a microphone that opened dead is noticed and rebuilt instead of
staying silent until the machine is logged out of and back in, there is a log at
%APPDATA%\com.joy.zetta-com\zetta-com.log, and the roster says which build
each machine is on.

1.3.1, 1.3.0 and 1.2.0 all work together. The wire format is unchanged, so
machines can be updated one at a time in any order. Machines on 1.0.0 still
cannot hear anybody and need updating.