Menu Time is upon us

I'm finally setting up the menus.   Hopefully they won't be too intrusive, but what they'll give us are:

• Main Menu/Splash screen
• Level-Up Menu for distributing bonuses
• Change Floors menu.  Elevators are more complicated than stairs, after all.

For my menus, I'm implementing a simple system that will let me put in cleverly appropriate background images, and have an easy keyboard-operated option selection.   Hopefully it works well.  I'll start adding more screenshots soon, and hope to have a playable version up tonight, so stay tuned!