Release v0.1.0-beta.26

Fix the obs.dll crash on exit by actually freeing the recording scene

The main canvas also references the scene, so disposing our wrapper
never destroyed it or its display and WASAPI sources. Every stop leaked
them, and at exit their capture threads pushed audio into libobs while
obs_shutdown freed it. Remove the scene before disposing it, and stop and
release outputs, sources and encoders before shutting OBS down.