Scoring and UI changes

-UI now has text that is editable (you have to type it first in notepad
however since Unity's interface does not allow type-able newline
characters)
-Fuel bar is now in a better position
- Run button now now longer dissappears when you click it
-Scoring now uses the remaining arrows as part of the score. Edited the
3 and 2 star score values on levels 1 & 2 to reflect that

Every new level should have the 3 and 2 star scores calculated rather
than just sticking with default to make it more challenging. I'm trying
to work on a fix for the pushable block colliding with arrows but I'm
having no luck so level 3 is currently impossible. Keep working on
things though.