Reset words when making a new set.

Fixes issue where the words wouldn’t line up if you quit and rejoined
the game.
Don't restart the renderer for each shape
Remove unused method
Each word remembers its last location

The initial position is also laid out uniformly on the screen to avoid
overlap.
Add flash class

Spaceheist.game.flash(…) will create a flash of the specified colour
over the screen. Can be used to indicated success/failure?
Display flash when correct sentence is formed
Various improvements to Repair module
Move Laser to its own package
Add the beginnings of the DrawShield module
Move the static list of modules

I kept looking for it in Module.java, so I moved it there.
Add EnergyHolder

An idea for how we can show energy.

There could be a column of crystals to the right of the module. Tapping
one activates it, and you get the corresponding bonus.
Add activate/deactivate methods to Module

These are called when you enter/leave a module.

Make the crystals hide by default when you enter repair. They are only
available for activation when you are looking at one possible location.
Add a basic DrawShield implementation

Just add some circles to the screen whilst you drag. Looks pretty
shocking, but I think it will be fun to deflect asteroids by drawing.

Works much better on phone than pc.