Smelter 0.4.0

Live Compositor is now Smelter. You can find our new documentation at smelter.dev.

Dropped support for SHADER_UNUSED_VERTEX_OUTPUT wgpu feature. (#733 by @jerzywilczek)
Renamed component properties describing color. Remove _rgba suffix. (#896 by @BrtqKr)
Replaced the LIVE_COMPOSITOR_OUTPUT_SAMPLE_RATE configuration environment variable with LIVE_COMPOSITOR_MIXING_SAMPLE_RATE. The output sample rate is now determined using encoder options on register_output. Changed the default output sample rate for AAC codec to 44100 Hz. (#925 by @WojciechBarczynski)
Changed prefix of all environment variables LIVE_COMPOSITOR_ → SMELTER_. (#941 by @wkozyra95)

Added loop option for MP4 input. (#699 by @WojciechBarczynski)
Added LIVE_COMPOSITOR_LOG_FILE environment variable to enable logging to file (#853 by @wkozyra95)
Added border, border radius, and box-shadow options to Rescaler and View components. (#815 by @WojciechBarczynski), (#839, #842, #858 by @wkozyra95)
Extended supported color formats. (#896 by @BrtqKr)
Allowed specifying output sample rates per output in register_output requests. (#925 by @WojciechBarczynski)
Added WHIP server as an input. (#881 by @wkazmierczak)
Added WHIP client as an output. (#834 by @wkazmierczak, @brzep)
Added Vulkan based hardware decoder. (#803, #875 by @jerzywilczek)
Added padding options to View component. (#931 by @noituri)

Fixed AAC output unregister before the first sample. (#714 by @WojciechBarczynski)
Fixed output mp4 timestamps when output is registered after pipeline start. (#731 by @WojciechBarczynski)

Now we automatically rename the file under the output path for MP4 output if it already exists. (#684 by @WojciechBarczynski)
video.encoder.preset is now optional in the output register. (#782 by @WojciechBarczynski)
Now we use FFmpeg option -movflags faststart when creating *.mp4 files. (#807 by @jerzywilczek)
Now, *.mp4 duration is being returned when registering inputs. (#890 by @wkozyra95)

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