Improve theme designer mode - part 2

Please test this using the Classic and Boost theme  Test source maps   Login as admin Navigate to Site Administration > Appearance > Themes > Theme settings Check the themedesignermode radio Save changes Right click any element on the page and click "Inspect" Verify  you see the names of scss files in the styles section of your browsers inspect window Click the name of the styles file Verify  the browser shows the contents of the scss file Test prefixes removal Navigate to your profile Click the Edit profile link Verify the select for field "Email display" looks okay. Test performance Navigate to various pages in Moodle Verify loading pages is quicker with this patch (it should be more than 50% faster) Test changing Scss values For this test you will need to be able to edit Moodle's source files Navigate to the Moodle homepage Open file theme/boost/scss/moodle/drawer.scss On line 42 change the background color of the drawer to "#000" Reload the page Verify the navdrawer background color is now black [data-region= "drawer" ] { background-color: # 000 ; }