Smelter 0.6.0

Rename var<push_constant> to var<immediate> in user-provided shaders (#1624 by @noituri)
User-provided shaders now need to include enable wgpu_binding_array;. (#2025) by @noituri)
Replace url field with stream_key in RTMP input, port is now defined globally via SMELTER_RTMP_SERVER_PORT (#1656, #1677 by @wkazmierczak)
Rename vk-video feature to gpu-video (#1942) by @jerzywilczek
Remove offset_ms from WHIP and WHEP inputs (#1974, #1857 by @wkozyra95)
Remove offset_ms from RTMP input (#1656, #1677 by @wkazmierczak)

Add bitrate option to software encoders (#1567 by @JBRS307)
Add keyframe_interval_ms option to all encoders (#1591 by @JBRS307)
Make framerate and resolution optional for V4L2 input (#1587 by @jerzywilczek)
Support BGRA and ARGB textures in DeckLink input (#1607, #1608, #1614 by @wkozyra95)
Add options to all WebRTC inputs/outputs to manage ICE candidates (#1727, #1734 by @wkozyra95)
- SMELTER_WEBRTC_UDP_PORT_RANGE
- SMELTER_WEBRTC_UDP_MUX_PORT
- SMELTER_WEBRTC_1_TO_1_NAT_IPS
Add pause support for inputs (#1798, #1843 by @wkozyra95)
Add seek support for MP4 input (#1817, #1830 by @wkozyra95)
Add /input/:id/update endpoint for pause and seek operations (#1798, #1817 by @wkozyra95)
Add side_channel option to all inputs for sharing input data with external processes (#1899 by @wkozyra95)
Add buffer_size_ms option to RTP, WHIP, and WHEP inputs to configure jitter buffer size (#1974 by @wkozyra95)
Add AUDIO_INPUT_PAUSED and VIDEO_INPUT_PAUSED WebSocket events (#1843 by @wkozyra95)
Add OUTPUT_ERROR WebSocket event when output/input fails after initialization (#1753 by @wkozyra95)
RTMPS support for RTMP input (#1777, #1677 by @wkazmierczak)

Add OpenAPI specification (#1692, #1703 by @JBRS307)
Support FFmpeg 8.1 (#1833 by @JBRS307)
Replace FFmpeg-based RTMP server implementation. (#1656, #1677 by @wkazmierczak)

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