0.9-beta: Localize the stats overlay text and ensure that it happens on the upd…

• Reduced the amount of work that happens during mutex locks. This seems to reduce the lag I've seen in some situations (e.g., low incoming framerate from NTR).
• Connection stats are now shown as a text overlay on the source instead of written to the log.

0.8-beta

Merge branch 'master' of https://github.com/nleseul/obs-ntr