Eclipse Layout Kernel 0.9.0

Besides the usual heap of bug fixes and small enhancements, this release brings major changes for our clients. While the full list of tackled issues and accepted pull requests can be found on GitHub, here are some of the most notable ones:

Upgrade to Java 11 and Xtext 2.28 (and Eclipse version to 2022-09)

Added top-down layout options.

Added libavoid for standalone edge routing.

Reworked rectpacking into phase infrastructure.

Improvements to our Rectangle Packing layout algorithms.