Changes to Planar Scenes

2023-10-18 12:47:14 UTC (Hans Georg Schaathun): Removed legacy material
2021-11-03 10:09:53 UTC (Hans Georg Schaathun): New session
2021-11-02 13:03:48 UTC (Hans Georg Schaathun): Added exercise
2021-10-19 11:09:15 UTC (Hans Georg Schaathun): stubs
2021-10-19 11:08:06 UTC (georg): stub