Custom css filters not adjustable

When applying some custom css it gets filtered. The admin has no control over what gets filtered and some very normal css (like min-height, list-style-type,...) gets thrown out because of it. I made a patch to get these settings adjustable by the admin. Just like the excluded classes and selectors you can now add or remove things from the list. Some more css might need to be added by default, but this is what I could think of right now.