RoutEngine 1.1.1: update notices and install counting

Install counting and update notices. Windows 1.1.1 follows on routengine.net.

• The macOS and Linux apps and the command-line version now tell you when a newer version exists. They never install anything by themselves.
• The update check says your operating system and CPU as well as the version, so installs can be counted without keeping IP addresses. See Privacy.
• routengine run now sends the anonymous usage statistics when you turned them on with routengine stats on, like the window apps (before, it never did).

Install: README. SHA256SUMS lists every file's checksum.