Standardized colors; also brought some whitespace into line.

After looking at our current website on 4 different monitors with
several different settings on each monitor, I concluded that we don't
have enough contrast in our website. This commit is primarily intended
to address this issue. Generally speaking, on mid to low grade monitors
I have considerably improved contrast and it looks pretty good. It does
not look as nice on the high-end monitors, though.

I am a horrible contributor who doesn't break my changes into multiple
commits so we get the spacing fixes this commit as well. I really do try
to do one 'feature' or change per commit, but I notice things that
bother me while fixing something else so I fix it...
Standardized a few more colors; also made the help dialog (press ?) easier to read.
Fixed bug 66517 by avoiding the margin altogether
Оновлення з офіційних репозиторіїв svn.php.net
Merge branch 'master' of https://github.com/php/web-php into my-dev