After a bit more testing, I realized that typing S, E, U, or R at any point during the game would trigger the aforementioned events.  So, that was fixed.  The problem arose while searching for star systems.  Now, you need to press Ctrl + the letter key to activate the mode switches.  I updated the galaxy guide packet.

In addition, I was encountering some issues building the project with a csv file, so I switched the default galaxy to a text file.  It didn't fix the mobile version of the web player, but it also didn't break the project, so I'm keeping it.  On the plus side, text files appear to be friendlier to godot builds.

Note: Users shouldn't notice a difference.  They'll still import new galaxies via a folder with .csv files.  The .txt format is just for the internal default galaxy.

All in all, a nice bit of cleanup.