Version 3.0-beta.1

Added a new cross correlation initialization routine and made it the default routine: SPACE_FILLING_ITERATIONS. This method does not try to fit the image to a plane, but uses feature matching to do a local estimate of 3D position, then branches out in a space filling process to cross correlate nearby subsets.

Also fixed a bug in using cine files with more than one background frame.

The example image files can be found here: https://github.com/dicengine/dice/releases/download/v3.0-beta.0/DICe_examples.zip