Shooting and Moving
 Goal for the day
 There is one big idea here.
 If I am located at (x,y), traveling at an angle of θ and I take a step.
 x will change by stepSize*cos(θ)
 y will change by stepSize*sin(θ)

 r is the size of the step.
 Note what is really important here is that each object keeps track of it's own transformation information.
 The object must maintain
 current rotation 0 ≤ θ < 360
 current location (x,y)
 This gets updated when the object is moved.
 And is used when the object is drawn.
 Center the object at the origin.
 Rotate by θ
 Scale if needed.
 Translate by (x,y)
 I added shots because I wanted to.
 How could we modify this to check for impacts avoid collisions?
 Remeber, we can querry the contex for the current transformation matrix.
 So we could compute our "center" in canvas coordinates.
 And projecting a point from the center, we could also compute our "scaled" radius.
 So we could build a vector of scene elements.
 And compute collision as before.