More keyboard navigation

[Auzzy]

It might be useful to add some keyboard navigation shortcuts. Stuff like:

• Open the calculate modal (Ctrl + C?)
• Go to the railroads tab (Ctrl + R?)
• Go to the map tab (Ctrl + M?)
• Open the import modal (Ctrl + I?)

[Auzzy]

I think especially with the redesign, this is less important. I'm gonna close this, and if I feel it's important later, I can reopen it.