RMG-3.9.23

This is our very first release of Electron packages for all three platforms. Cheers 🎉

With this package, the RailMapGenerator could run totally offline and work with in any network environment as all cdn resources have been cached and bundled in this package.

All features should work with one exception. New Canvas -> Choose a Template will result a black screen and this is a known issue (see #96). Workaround is to restart the program and the selected template will be shown correctly.