Bigsh0t in Stereo(graphic)

A new version of Bigsh0t is available! This time with a new filter.

Stereographic projection: you can now make "little planet" videos with Bigsh0t. See example below.
Viewport UI: Click and drag in the viewport to set yaw, pitch and roll in filters that have these parameters.
Bugfix: Bigsh0t 2.4 would crash due to a divide-by-zero in the arctan2 function.
Tech debt: Bigsh0t still uses code generation to create the QML files for Shotcut, but the reliance on generated code has been reduced and the generated code prettified.