Windows Event Log integration

[pgaskin]

• [x] Figure out how the event log API works.
• [ ] Decide whether to have PA itself create the event source if it doesn't exist or whether to leave this to the installer (I think logs will go into Application if the event source isn't found).
  • [ ] Allow all users to write to the event log when creating the event source.
• [ ] Decide whether to make PA use the event log by default (it currently does this for systemd-journald).
• [ ] Integrate it with pulseaudio/src/pulsecore/log.c.
• [ ] Upstream the patch?