Button functions

Buttons used in every task:
	Move a point by clicking and dragging.
	Undo your last step - and the step before that, and so on...
	Clear everything and start the task again.

Specialised buttons:
	Add a point by moving to the position you want and clicking (or by pressing, dragging then releasing)
	Construct a line through two points by clicking then dragging then clicking again.
	Construct a perpendicular to a line by first selecting that line and then dragging to a point.
	Construct a parallel to a line by first selecting that line and then dragging to a point.
	Construct a circle by choosing the centre and a point on the circumference.
	Compass: draw a circle by clicking first where the centre is, then where the circumference is and last where you want this circle positioned.

Extra buttons:
	Construct the midpoint between two given points.
	Bisect the anglebetween two lines.
	Measure the angle between two given lines.

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