v1.2.0

First public release, prepared in #2.

What's Changed

• Bundle lanelet2 repositories by @lreiher in #1
• Prepare for public release as v1.2.0 by @lreiher in #2
• Harmonize naming of ll2 related vars, classes, etc by @lreiher in #4
• Improve logging by @cgeller in #5

New Contributors

• @lreiher made their first contribution in #1
• @cgeller made their first contribution in #5

Full Changelog: v1.1.1...v1.2.0