Make the supported colorTheme LESS sections compatible with the CSS properties system

Supported Flamingo themes contain some customizations of the color theme in their Advanced -> @lesscode field. In order to be able to migrate the LESS stylesheets to CSS native ones, we need those customizations to have an equivalent in CSS. We want to keep the compatibility of those customizations with LESS for a bit. We'll need to pretty much double the length of customizations to fit both systems. Since those are non-standard, there's no quick/error safe way to do it.