upgrade scalachess
Merge branch 'Divider' of github.com:ornicar/lila into Divider

* 'Divider' of github.com:ornicar/lila:
  Better styling
  Move Accuracy => Average Loss

Conflicts:
	modules/chess
styling must always be done in CSS
tweak analysis view
tweak analysis JS perf
upgrade pdfexporter
cleanup .gitignore
reformat analysis synthesis
serve favicon through CDN
too bad, cloudflare won't cache sound files
truncate average cp loss to zero
batch process similar reports
temporary disable PDF export
stop indexing exports
better move accuracy
caching tweaks
remove round hijack detection code
fix friends box JS
tweak caches
upgrade mithril.js