Incorporate most of the features from the CSS Styles page (part of the CSS Extensions) into the main GeoServer styling page in order to improve the main page.
TB: Initial pull request, JG review
TB: Remove CSS Extension GUI (now that it is migrated)
JG: YSLD Reference Documentation
TB: Stay on page when Submit Apply button is pressed
Create a new style, do not edit anything, switch to the preview tab, boom
Create a new style, do not editing anything, switch to the associations tab, boom
Create a new sld_style, call it test_1, generate a style for points, submit (and thus back to the style list page). Go back and edit it, switch to the publishing tab, boom.
Edits are getting lost while switching tabs