Demo v1.04

There's a new demo build out that fixes several bugs, and includes a graphical overhaul of the shipyard to make it more intuitive.

--Fixed rare crash on scene change

--Fixed quirk in enemy behavior that could prevent them from focusing correctly

--Tweaked difficulty settings to make Gentle and Gentlest modes easier

--Fixed a rare situation in which a ship could have no mass

--Redesigned the ship yard to be more intuitive. Now specific module replacements are done by an animated servo arm instead of navigating screens. The basic process flow is similar, but it should be more obvious what's happening.

--Updated tutorial text to be more helpful

--Added optional additional help popups that explain mechanics in more detail

--Fixed a monitor selection bug

--Changed Options Menu to be accessible during play

--Changed Options Menu and the Pause Menu to have a more consistent visual style.