altered progressbar to not rely on first progress request coming after the job has started; may help with broken progressbar some people say they have

split masking helper function from processing.py into new masking.py

fixed typos in processing.py

Replace existing images when pasting from clipboard or dropping a new one (fixes #573)

fix batch color correction

Fixed "CodeFormer visibility:" rounding to 2 decimals.

Move scale multiplication to the front