WIP, not hooked in

Add signedNextInt()

- ChaCha20: Add ivOffset param
- ChaCha20/Poly1305: Add adOffset/adLength params
- Noise: Add XK-SSU2 initializer
- Noise: Add notes about handshake offsets

copied from i2prouter script

Make Docker host networking safer

See merge request !54

set table-width to fixed on console dark theme, and run the auto-indenter on the console light theme to fix it's inconsistent tabs. Merge the chrome-overrides rules on the console light theme CSS. Changes to light theme are entirely cosmetic, except that they improve the reliability of my CSS linter.

Use GitHub Actions to publish installer.jar on each push

set .wizardimg css to display: none on the dark theme so the light-theme background images don't show up. Normalize the wildly inconsistent tabs tabs in console.css

Update RI reachability after first inbound connection
Allow local address in test mode

SSU: Don't bid on connection to buggy routers

Revise ShellService.name to match ShellService directory if the directory includes -SystemVersion.getOS or -SystemVersion.getArch

Check executable status of shellservice plugins in start. If the ShellService plugin name doesn't correspond to a directory, check plugin name+-$OS-$ARCH and name+$OS.