Conversion of emcc docs to form that can easily be converted to text. Full review of that doc.
Fixes to fonts and some text as result of final review by Jukka on a number of docs
suppress unneeded benchmark notification
simplify other.test_emcc --help detection to try to fix it on windows
Merge branch 'incoming' of https://github.com/hamishwillee/emscripten into incoming
use text output for local doc builds, and make emcc --help read and print its docs