Mir 0.8 Works On Less ABI Breakage, Touchspots, Responsiveness

While Ubuntu 14.10 on the desktop isn't using Mir by default, Mir 0.8.0 is being prepared for release by Canonical and it has a number of interesting changes.

Among the Mir 0.8 display server highlights are:

- Support for touchspots to visually show touch locations on the screen, albeit at the cost of performance.

- Mir clients can now expose performance information like frame rates and render times via setting the MIR_CLIENT_PERF_REPORT=log environment variable to dump the performance information to the standard output.

- Less sensitivity to ABI breaks by hiding headers from being exposed that have been unused by external projects, etc. There's also more scripts now to detect ABI breakage.

- More improvements to touch responsiveness -- including less lag and smoother scrolling.

- Hardware overlays are now enabled by default.

- A large number of bug-fixes.

More details can be found via the Mir Bazaar repository.