Missile Targeting plus others

Missile targeting now complete, uses giant crosshair to indicate current
hovering selection, turns yellow when missile has been selected and is
in progress.

Clicking on the window (which now is a button) will clear out the
problem zone and whiteselect a missile, indicating arrow keys can be
used for navigation.

Fixed clock child/parent issue, observed one instance of double time
bug, need to figure out what causes it, would not repeat bug despite my
attempts.

crosshair prefab and sprite thingy also added, need to figure out the
issue of changing camera angle moving the crosshair around.