new icon: processwire (original, original-wordmark, plain-wordmark)

[SkyLundy]

Double check these details before you open a PR

• [x] PR does not match another non-stale PR currently opened
• [x] PR name matches the format new icon: Icon name (versions separated by comma). More details here
• [x] PR's base is the develop branch.
• [x] Your icons are inside a folder as seen here
• [x] SVG matches the standards laid out here
• [x] A new object is added in the devicon.json file as seen here

This PR closes NONE

Link to prove your SVG is correct and up-to-date.

https://processwire.com

[SkyLundy]

@Snailedlt Both colors have been used in different locations, so I talked to the ProcessWire repo owner & primary developer @ryancramerdesign who confirmed the blue featured on the website is a good choice. I've pushed that change in the latest commit.

[github-actions[bot]]

Hi!

I'm the check-bot and we have some issues with your PR:

devicon.json is not sorted correctly.
Please make sure that your icon is added in the `devicon.json` file at the correct alphabetic position
as seen here: https://github.com/devicons/devicon/wiki/Updating-%60devicon.json%60

Check our CONTRIBUTING guide for more details regarding these errors.

Please address these issues. When you update this PR, I will check your SVGs again.

Thanks for your help, SVG-Checker Bot :smile: