Release v1.4.0

• Multi-Track Audio: Added multi-track playback with per-track mute and per-segment track selection and volume when creating clips. Closes #89.
• Multi-Track Audio: Added detection of multi-track audio on imported recordings. Closes #88.
• UI: Renamed "Selections" to "Segments".
• Window Detection: Added 15:8 aspect ratio support so windowed Minecraft is detected properly.
• Game Integrations: Switched game matching to IGDB IDs instead of names for more reliable detection.
• PUBG: Fixed the integration never activating due to a name mismatch.
• Updates: Added support for the beta release channel.
• Security: Fixed path injection, command injection, and XSS issues.