Part 1 - Switch upstream source to khaledhosny/ots. b=941019, r=jfkthame.
Part 2 - Apply patch to make Process function externally visible for Windows DLL. b=941019, r=jfkthame.
Part 3 - Add #ifdef's to disable WOFF2 support. b=941019, r=jfkthame.
Part 4 - Update README.mozilla, moz.build files and local patches. b=941019, r=jfkthame.
Part 5 - Remove MOZ_OTS_REPORT_ERRORS, whitelist Graphite/SVG tables and use SetMessageCallback. b=941019, r=jfkthame.