cmd/systray: WIP of a linux systray appwill-systray

This adds a systray app for linux, similar to the apps for macOS and
windows. There are already a number of community-developed systray apps,
but most of them are either long abandoned, are built for a specific
desktop environment, or simply wrap the tailscale CLI.

This uses fyne.io/systray (a fork of github.com/getlantern/systray)
which uses newer D-Bus specifications to render the tray icon and menu.
This results in a pretty broad support for modern Desktop Environments.

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This is a work in progress. Some things are still half-built, this is
just where I stopped to take a break.

 - fast user switching works
 - connect and disconnecting work, and show correct icon (including the
   animated loading icon while connecting)
 - devices menu works, but seems to have issues with really large menus,
   either crashing or rending off-screen with no scroll option.
 - clipboard and notification integration works to copy device IPs
 - exit node menu is built, but currently non-functional (this is where I
   stopped). Exit nodes are not re-rendered when switching profiles.

The code is currently "okay", but certainly needs cleanup, docs, etc.

Signed-off-by: Will Norris <will@tailscale.com>

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