Core - Rework style / theme

[EmmmaTech]

This one tackles issue #132, where the current Style/Theme system is reworked.

Here's what's done so far:

• Reworked the concept of Style and Theme, where Theme stores both colors/metrics
• Changed from using a programmatically way to define values to an XML way
• Made Style wrapper for backward compatibility

[JSH32]

Ok I know this is a bad place to contact but is your fork of borealis stable enough to use in a normal app? I'm noticing problems with borealis currently like the fact that it was in a rewrite when I cloned it over. Hints don't show and all that. I assume you fixed that based on the issue history of this repo?

[EmmmaTech]

It might be. You'll have to merge the commits from my libnx branch fix and my other feature branches in order to use the features I implemented

[JSH32]

Does your fork have any way to make a list of various objects, maybe like a game list? Or like the old implemented full width buttons in SimpleSaveManager for example?

[EmmmaTech]

You should be able to make that with the tools you're provided with, but I don't think that's built into the yoga rewrite