[Therion] Mapiah version 0.2.16 released

Hi, In this weekly Mapiah release we have: - New features: - Using MPOverlayWindowBlockWidget at MPSnapTargetsWidget to improve reading. - Snap to XVI file features. - Snap spatial index. - Improved snap icon. - Add/remove lines from areas. - Fixed bugs: - Lines added to areas not getting IDs associated to them. - Mapiah throws if line referred by area does not exist. - Infrastructure maintenance: - dart fix --apply - flutter pub upgrade. Release 0.2.16 is available at https://github.com/rsevero/mapiah/releases/tag/v0.2.16 for desktops and at https://mapiah.org/webapp/ for web. Enjoy. Rodrigo