228 adding more image processors for spot analysis

[bbean23]

Purpose

Lots of new image processors:

Name	Short Description
Background Color Subtraction	removes a common color or gradient color from an image
Custom Simple Image Processor	provides a simple way to modify primary images
Enclosed Energy	how much energy is within a region with a variable radius
Inpaint	replaces masked pixels with an average of their neighbors
Moments	computes moments, useful for centroids and primary axis angles
Powerpoint	generate powerpoint decks from the results of a spot analysis task
Save To File	saves the image at the given step to a file on disk, useful for debugging
Spot Width	estimates the size of a spot by its full-width-half-maximum (FWHM)
Stabilization	digital stabilization based on image features
View Annotations	draws the annotations on an image
View Highlight	draws the pure black/white regions of an image in a different color

fixes #228

Summary of changes

Add many new image processors, and even some tests for a couple of them!

Implementation notes

Correctness was not formally verified for many of these except through light usage.

Submission checklist

• Target branch is develop, not main
• Existing tests are updated or new tests were added
• opencsp/test/test_DocStringsExist.py are verified to include this change or have been updated accordingly
• .rst file(s) under doc/ are verified to include this change or have been updated accordingly

Additional information

This will be part of a series of PRs to get the code that I've been working on checked in so that Randy or Braden can take over the spot analysis work.