forcing "start" text alignment (left or right depending on document language) does not work with "inherit"

[danielweck]

In Thorium (Chromium web browser engine) we need this ReadiumCSS patch for the left/right (or start) override of justified text:

edrlab/r2-navigator-js@aaaddf5

https://github.com/readium/readium-css/blob/583011453612e6f695056ab6c086a2c4f4cac9c0/css/src/modules/user-settings-submodules/ReadiumCSS-textAlign_pref.css#L9-L16

[JayPanoz]

This is probably a CSS declaration we can add in ReadiumCSS to make it easier for everyone.

With specs such as logical properties, values like start and end are meant to become more popular so that would future-proof ReadiumCSS a little bit.