Continuing to streamline style usage

[timea-solid]

This work concludes this Issue #533 :

• move almost all styles to style.js from each file. and fixed some typos in the process. (point 4 on the issue list).
• streamline also styles in use with ns.ui('style') or ns.ui('background') (point 3 on the list)

Now we can start talking about changing the UI style.

[bourgeoa]

@timea-solid could you look at this issue ?

[bourgeoa]

This is the issue https://github.com/SolidOS/solid-ui/blob/878273708d800d65e33b0aec1568577c3df7e32b/src/tabs.ts#L185 and I don't understand why. The evaluation is not done correctly

I tried here and It does not work also when using our function