v1.0.1

ffmpeg is now bundled with the installer.

Previously the app needed ffmpeg on PATH before clips could be played. It now
ships with its own copy and uses that in preference to any system install, so a
fresh install works with nothing else to set up. Settings shows which ffmpeg is
in use and where it is, and can still be pointed at a different build.

The bundled binary is the LGPL build from BtbN/FFmpeg-Builds. Clips are
stream-copied rather than re-encoded, so nothing beyond LGPL is required.

Also in this release:

• Settings shows the installed version and a Check for Updates button
• Uninstalling asks whether to remove settings and cached clips, and leaves
  Steam recordings and screenshots untouched

The installer is larger than 1.0.0 because of the bundled ffmpeg. It is
unsigned, so SmartScreen will warn on first run: choose More info, then Run
anyway.