This automatically launches Kopia CLI with new flags:
`--tls-generate-cert` which generates in-memory TLS certs for the server
and prints its fingerprint to stderr.
`--random-password` which sets up random base auth password
KopiaUI will then listen to the stderr messages and parse the cert
fingerprint and password and automatically provide them in the browser
it opens to show the UI.
This ensures that any local process (or script in a browser, etc.)
other than KopiaUI itself won't have access to the server API nor
UI because they won't know the ephemeral random password and won't
be able to intercept it due to TLS protection.
There's now one target, `travis-release` that can be run
locally, or on Travis CI except for:
- code signing (Travis on non-PR runs)
- publishing artifacts to GH releases (Travis on tagged releases)
- creating long-term repository for testing (Travis on tagged releases)
* app: added desktop app shell based on Electron that runs in the tray, starts a background kopia server and allows access to the UI
* icons: updated icons for the app
* htmlui: flexible containers
