use correct number format

[borondics]

In multiple point in the code there are integers where there should be floats. I don't know if this is important at all, but it would be nicer to remove this point for confusion and use 1.0 instead of 1 and 0.0 instead of 0 whenever we add a number.

https://github.com/Quasars/pySNOM/blob/06b0450ef35621862b3619d0c94c9e1163d10c3b/pySNOM/images.py#L179C41-L179C48

[ngergihun]

Done with #18