Shortcuts should be explained better

[alochmann]

Several shortcuts and details (like F3 vs. Shift-F3, or Shift-ESC) are only explained in the manual. It would be better to demonstrate them in game. There is the context-depending help menu, which in itself needs the knowledge that F1 typically shows a help screen. Unfortunately, these are conventions not everyone knows, so we need a better way to communicate them.

Another very unlucky example is the Shift+Ctrl combo to reload a level file when it restarts. This is not documented, and its difference to a normal restart needs additional explanations. It might actually be better to always reload a file when it restarts, or to define an option in the options menu to toggle reload.