Better RTL css for the system
Some issues might still exist, especially the issue of inline CSS used in too many places, but this one provides a pretty good option for now.
Notice: This patch is mainly a clone of application.css with RTL overrides, but it is better than before and there is more to come.
We originally worked on the 2.4.3 version of application/rtl.css, but I fitted it to meet the master branch version.
RTL users, please try it out and notify me of anything.