Links zu Flugplätzen angepasst.
src/common/webmap/WebMapFlight: unique interface with begin and end.
stations/trend/trend.py: migrated to python3.
sw/raspapp/src/Application.cpp: printf of playlists only on debug.
sw/raspapp/src/Application.cpp: clear playlist just to be sure.
sw/raspapp/CMakeLists.txt: cmake version test to 3.25.
sw/raspapp/src: validate connection, before load playlist.
raspberry_pi_4/rootfs_overlay/mnt/disk/WWW/sunshine.pls: adjust url.