Post 7DRL bugfixes

Fixed several crash bugs! (my bad)
It is still a performance hog tho, that won't go away until the homemade engine switches from canvas2d to webgl.

I also added the missing "health bars", bottom left is your ship and bottom right is the targeted enemy. Double bars is your shields, single bars is your armour, and the center block is your core components. You get front, back, left, and right of shields and armour and core is a single value.  If a core reaches zero the ship blows up.  Shields don't regen, that didn't make it into the 7drl.  All these other systems like directional armour and directional hits were there, I was just too tired to talk about them in the release notes.  I'll update the game description with these details as well : )

Good hunting!