Use OpmResult defined in error module.

Separate Dottable trait to additional file.

Add unit tests.

Function was completely rewritten. Fixed many clippy warnings and
reformatted code.

Works in principle but awfully slow because of resampling.

Not working yet....

Change some function privacy settings.

Fix some doc errors.

Add splitting ratio to Beamsplitter (not used yet).

Add example src-detector.