Added score, max score is set at 9999999. 

If you want a higher max score it needs to be adjusted accordingly with
max digits or it will try to create an array with negative entries and
crash.

Hacked a printRight method from printCentred method. There's an
unnecessary width variable at the moment, but the function works fine
with it set to 0 so I've left it. Feel free to clean it up if you
understand how.
Refactored score into it's own class.

Added a method to draw the multiplier level and the background for the
multiplier bar. Still need to make the actual bar.
Refactored score into it's own class. Broke the aircraft tests and I'm
not sure how to fix them.

Added a method to draw the multiplier level and the background for the
multiplier bar. Still need to make the actual bar.
Merge branch 'ScoreAndMultiplierDisplay' of https://github.com/liam-m/SEPR-MQV-2.git into ScoreAndMultiplierDisplay
Modified how score is calculated/stored a bit.
nm, u?
Fix tests
multiplier increase equal across all difficulties (currently 1)
Refactored score a bit more.
Added a method the calculate an aircraft's score, and efficicency to
score class.

Aircraft now have a variable, with getter and setter, for their
individual score.
Very broken preliminary multiplier bar. Fix tomorrow, I need sleep.
Multiplier implemented.

Scoring system heavily changed, aircraft now have a varirable for adding
to the multiplier, fixed bound for multiplierVariable (now called
meter_fill).

Multiplier level adjusted when the meter_fill hits it's bounds
(currently 0 and 256).
Merge ScoreAndMultiplierDisplay