release urshd 1.1.0

- the old Subversion repository was migrated to Git, it can now be found at
  <https://git.pengutronix.de/cgit/tools/urshd/>.
- add README, Changelog, licensing information, etc.
- add IPv6 support: the daemon now listens on IPv4 and IPv6.
- improved error handling in the daemon.
- debug version is now built with only minimal optimisation, and has GDB
  debugging symbols enabled.
- some janitorial code maintenance.
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