Doomsday Engine

Bumped minor version from 9 to 10 (=> 1.10.0)

Old meaning of version components:
- 1: major
- 9: minor
- 10: revision
- 0: patch

Updated new meaning, dropping down to three components:
- 1: major (large architectural changes)
- 10: minor (normal releases on the roadmap)
- 0: patch (extra releases for fixes)