Small cleanup in admin part CSS files

[Simek]

I tried to optimize, clean and make those CSS files easily to read.

Changes tested with latest revision.

[azaozz]

Thanks for the patch. We will need to do a lot of cleaning of all css files to remove all old/not used styles left over from 2.6 and early Crazyhorse.

One thing though: can you leave selectors with only one setting be on multiple lines, so instead of

.widefat { border-color: #dfdfdf; }

which actually is harder to read, make it:

.widefat {
    border-color: #dfdfdf;
}

using a tab to indent it.

Also when specifying one setting for multiple selectors, the preferred format is to put each selector on a new line (much easier to read) like that:

.wp_themeSkin a:link,
.wp_themeSkin a:visited,
.wp_themeSkin a:active {
	color: #000;
}

(I know there's some software that would format css files automatically.)

[Simek]

Thank you for advices azaozz. I'll prepare new patch for those files.

[Simek]

"press-this.css" file cleanup with azaozz advices

[azaozz]

(In [9370]) Some CSS cleanup, props Simek, see #7967

[azaozz]

(In [9371]) Press This CSS cleanup, props Simek, fixes #7967

[Simek]

New patches for:
"wp-admin\css\media.css"
"wp-admin\rtl.css"

Media.css => Cleanup, others opacity types added.
RTL.css => Cleanup, -moz-border-radius reduced to one line.

[azaozz]

(In [9383]) media.css and rtl.css cleanup, props Simek, fixes #7967