Gstreamer is not necessarily governed by a real-time clock, thus we need to pull from it only when we need..
Update version before the release.
Check for git revision first.
Updated INSTALL
Add interactive.bool.
Go back to scm version after release.
Reworked OSC builtins.

- More modular code (avoid code duplications).
- Add osc.on_* to register handlers.
- Handle strings and string pairs.
Switch exception resolver to non-exception implementation to avoid
wasting current backtrace..
Merge remote-tracking branch 'origin/master' into server-name-downloads
Enable external processes stuff for Win32.