[Development] Font rendering on X11/Wayland: New FreeType API to toggle LCD filters and stem darkening on a per-font basis, would love a review

[Allan Sandfeld Jensen]

Here is a proof of concept: https://codereview.qt-project.org/#/c/177325/

Note, we need a FreeType API for getting to the module-name from the face, or 
a direct getter of the stem-darkening on the face. 

Best regards
`Allan