bump crengine: revamp CSS 'inherit' handling, other fixes (#1651)

Includes:
- SVG: <epub:switch/case/default>: accept SVG
- Text: don't adjust spacing of leading no-break-space
- Block rendering: fix "break-before: always" sometimes not ensured
- Styles: parse <style> as white-space: pre
- CSS: revamp 'inherit' handling, now fully per CSS specs
- CSS/colors: handle 'transparent' as a real color