Processors refactoring

[Sergio0694]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules 👮.
• I have provided test coverage for my change (where applicable)

Description

This does some ground work for #967.
I'm creating this as a draft PR as I'm unsure about a couple of things, and there are a few lines that cause the current branch to fail to build. I've done most of the refactoring following step by step the instructions for the "Proposal to refactor current ImageProcessor logic" section.
Need some feedback to continue with this, and of course everyone else is free to just jump in and finish the remaining details as well 😄

What I did so far

• Added Image<TPixel> Source and Rectangle SourceRectangle as protected properties to the ImageProcessor<TPixel> class
• Also added a Configuration property (retrieved from the image)
• Modified the ImageProcessor<TPixel> constructor to take an image and rectangle
• Refactored constructors of all inherited processors to take and bubble up the image and rectangle
• Modified CreatePixelSpecificProcessor to take target image and rectangle
• Removed parameters from the Apply method, as they're now members
• Did the same for the CloningImageProcessor<TPixel> and inherited processors
• Removed duplicate parameters from all ImageProcessor<TPixel> methods (Apply, BeforeApply, AfterFrameApply and all the others)
• Refactored the DefaultImageProcessingContext class to use the new architecture

[JimBobSquarePants]

@Sergio0694 I'll do some work on this later to get it building. Then we'll see where we are.

It'll be wise to add a checkbox list to the description here to tick off what you have done so far.

[Sergio0694]

Hey @JimBobSquarePants - I've just updated the PR description with all the info you requested, hope it helps! 😊

[JimBobSquarePants]

@Sergio0694 I got the source building, test still not yet though. If you could get them building I could then crack on with implementing IDIsposable.

[codecov]

Codecov Report

Merging #983 into master will increase coverage by <.01%.
The diff coverage is 96.25%.

@@            Coverage Diff             @@
##           master     #983      +/-   ##
==========================================
+ Coverage   89.71%   89.71%   +<.01%     
==========================================
  Files        1097     1097              
  Lines       48538    48576      +38     
  Branches     3421     3421              
==========================================
+ Hits        43546    43582      +36     
- Misses       4289     4291       +2     
  Partials      703      703

Impacted Files	Coverage Δ
...ng/Processors/Convolution/EdgeDetectorProcessor.cs	100% <ø> (ø)	⬆️
...rs/Normalization/HistogramEqualizationProcessor.cs	83.87% <ø> (ø)	⬆️
...ing/Processors/Dithering/PaletteDitherProcessor.cs	100% <ø> (ø)	⬆️
...ocessors/Quantization/QuantizeProcessor{TPixel}.cs	0% <0%> (ø)	⬆️
src/ImageSharp/Advanced/AotCompilerTools.cs	0% <0%> (ø)	⬆️
...ssing/Processors/Quantization/QuantizeProcessor.cs	0% <0%> (ø)	⬆️
...ing/Processors/Transforms/CropProcessor{TPixel}.cs	100% <100%> (ø)	⬆️
...ogramEqualizationSlidingWindowProcessor{TPixel}.cs	100% <100%> (ø)	⬆️
...s/Convolution/Convolution2PassProcessor{TPixel}.cs	100% <100%> (ø)	⬆️
...ng/Processors/Overlays/BackgroundColorProcessor.cs	100% <100%> (ø)	⬆️
... and 86 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #983 into master will increase coverage by <.01%.
The diff coverage is 96.24%.

@@            Coverage Diff             @@
##           master     #983      +/-   ##
==========================================
+ Coverage   89.71%   89.72%   +<.01%     
==========================================
  Files        1097     1097              
  Lines       48538    48573      +35     
  Branches     3421     3421              
==========================================
+ Hits        43546    43581      +35     
  Misses       4289     4289              
  Partials      703      703

Impacted Files	Coverage Δ
...ng/Processors/Convolution/EdgeDetectorProcessor.cs	100% <ø> (ø)	⬆️
...rs/Normalization/HistogramEqualizationProcessor.cs	83.87% <ø> (ø)	⬆️
...ing/Processors/Dithering/PaletteDitherProcessor.cs	100% <ø> (ø)	⬆️
...ocessors/Quantization/QuantizeProcessor{TPixel}.cs	0% <0%> (ø)	⬆️
src/ImageSharp/Advanced/AotCompilerTools.cs	0% <0%> (ø)	⬆️
...ssing/Processors/Quantization/QuantizeProcessor.cs	0% <0%> (ø)	⬆️
...ing/Processors/Transforms/CropProcessor{TPixel}.cs	100% <100%> (ø)	⬆️
...ogramEqualizationSlidingWindowProcessor{TPixel}.cs	100% <100%> (ø)	⬆️
...s/Convolution/Convolution2PassProcessor{TPixel}.cs	100% <100%> (ø)	⬆️
...ng/Processors/Overlays/BackgroundColorProcessor.cs	100% <100%> (ø)	⬆️
... and 85 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[antonfirsov]

I could not find any major issue.
Since the changes are consistent, we can merge this as is and continue work in an another PR. @JimBobSquarePants @Sergio0694 how do you want to proceed?

[Sergio0694]

@antonfirsov alright, I've fixed that small leftover you mentioned and marked the PR as ready for review, so you're free to merge this now if you want 👍

[JimBobSquarePants]

Ok, let’s merge this as-is then and I’ll open a new PR for using IDisposable since I’ve already made a start.