0.76.0

• Added Application._executeStartupFiles() method (#354).

• Added RemoveChannels image node.

• Added a PointConstraint node (#482).

• Fixed framing error when entering a Box.

• Image viewer now displays channels in grey scale.

• Added Widget.widgetAt() method.

• Added ability to hide tabs in layouts.

• Fixed bug converting coshader array from fixed to variable length.

• Added Serialiser::postScript() method.