Feature: #81223 - includeCSS.inline property

See Issue #81223

Description

A property .inline has been added to page.includeCSS. If .inline is set, the content of the css-file is inlined using <style>-tags.

Impact

Example:

page.includeCSS {
        inline = EXT:test/Resources/Public/Css/inline.css
        inline {
                inline = 1
                forceOnTop = 1
                media = all
        }
        other = EXT:test/Resources/Public/Css/other.css
}

Some notes on the implementation:

External files are not inlined. The inline-css is compressed if config.compressCss is set. Most other properties (.allWrap, .disableCompression, .forceOnTop, .if, .media, .title) work even if .inline is set. If .import and .inline are both set , the file is loaded via @import.