Replacing Inline Styles with Stylesheets.

[Level6Rogue]

Hi all.
I found the inline styles used in the various fields and attributes to be limiting when modifying elements with stylesheets.
I've gone through and replaced most of them with stylesheets.
I belive this is also more performant: https://docs.unity3d.com/Manual/UIE-USS-WritingStyleSheets.html

This is pretty much my first time contributing to someone elses project so I figured I'd start a discussion before making a pull request.

You can find my changes here:
main...Level6Rogue:Alchemy:moving-inline-styles-to-stylesheets

[Level6Rogue]

I've just gone ahead and made some changes to more closely follow the guidlines in the above attached doc.