quadcap 0.3.0

Changes in v0.3.0

• Update the pinned GitHub actions (020678e)
• Address the CodeQL findings and stop quadcapd misreporting its version (d3a8604)
• Depend on gstreamer1.0-gl, and describe every download in the README (f5e2100)
• Send video and each audio source to OBS (7896514)
• Generate an OBS scene collection wired to quadcap's outputs (6ba3937)
• Release 0.3.0 (d3c752a)

Verification

• Release build compiled with warnings treated as errors
• Unit and integration tests passed
• Formatting, ShellCheck, Cppcheck, and QML checks passed
• The archive checksum is attached beside the bundle

Downloads

• quadcap-0.3.0-x86_64.AppImage runs on any recent distribution and
  bundles Qt and GStreamer. Still needs the sc0710 driver installed.
• quadcap_0.3.0_amd64-ubuntu24.04.deb for Ubuntu 24.04. quadcap links
  Qt's QML private ABI, so this package will not install against another Qt
  patch release; use the AppImage or build from source elsewhere.
• quadcap-0.3.0-linux-x86_64.tar.xz carries the source, the pinned
  driver, and packaging/install.sh, which sets up DKMS and Secure Boot signing.