The params docs now state the direction (and the zero) of each angle or
rotation a command takes; behaviour is unchanged. Shape creation, text.create,
the grids, add-on shapes, saved views, Liquify, Puppet Warp pins, Mirror and
Radial Repeat and Vector Halftone turn clockwise; text character rotation,
gradients, the eraser tip and print screen angles turn counter-clockwise.
view.saved.new's rotation note changes its schema, so the API level goes to 3.
A test walks every command's params doc and fails when a param named like an
angle or rotation doesn't say clockwise or counter-clockwise.