Remove all ImageSharp.Web Processors and then re-add in the correct order

[Jeavon]

Currently, the order in which the ImageSharp processors are registered determines the order of processing so in Umbraco we currently lose the ability, for example, to set the background colour as the resize command comes after the bgcolor processor.

e.g. sample.png?width=503&height=300&rmode=pad&bgcolor=red does not work, it does with this PR

It's likely in ImageSharp.Web 1.0.4 the order will be determined by the querystrings but not currently with 1.0.3 SixLabors/ImageSharp.Web#182

This PR removes and re-adds all the built-in processors in the correct order so all commands work.

[umbrabot]

Hi there @Jeavon, thank you for this contribution! 👍

While we wait for one of the Core Collaborators team to have a look at your work, we wanted to let you know about that we have a checklist for some of the things we will consider during review:

• It's clear what problem this is solving, there's a connected issue or a description of what the changes do and how to test them
• The automated tests all pass (see "Checks" tab on this PR)
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• The level of performance for this contribution is the same or improved
• Avoids creating breaking changes; note that behavioral changes might also be perceived as breaking
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[nathanwoulfe]

Works nicely, thanks @Jeavon

[bergmania]

Cherry picked to 9.0.1

[ronaldbarendse]

@Jeavon Nice catch and good example of why it really needs to use the processing order from the URL! 💪🏻 The linked PR just got merged and ImageSharp.Web 1.0.4 is released, so we can update to this version and remove these work-arounds 😄

[umbrabot]

Hi there @Jeavon,

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