Add new packages and build scripts for various libraries

- Added Nuklear GUI library with build script and configuration.
- Introduced OpenH264 encoder/decoder with build configuration.
- Added PortAudio library for audio I/O with custom build script.
- Included Python Execnet for multi-Python deployment.
- Added Pytest Xdist plugin for distributed testing.
- Introduced Shaderc for shader compilation tools.
- Added Snappy compression library with necessary patches and configuration.
- Included SoundTouch audio processing library with build configuration.
- Added SRT library for secure reliable transport.
- Introduced VapourSynth video processing framework with configuration.
- Added Vid.stab for video stabilization.
- Included WebRTC Audio Processing library with build configuration.
- Added X264 video encoding library with patches for POSIX compliance.
- Introduced X265 video encoder with build configuration.
- Added XKeyboard Config for X keyboard configuration files.
- Included Xorg XKBComp for keyboard description compilation.
- Added Xvidcore MPEG-4 video codec library with configuration.
- Introduced ZeroMQ messaging system with patches and build configuration.
- Added Zimg library for scaling and colorspace conversion.

extra/libdovi/build.sh

@@ -0,0 +1,14 @@
+cargo cbuild \
+    --release \
+    --prefix=/usr \
+    --manifest-path dolby_vision/Cargo.toml
+cargo test \
+    --release \
+    --all-features \
+    --manifest-path dolby_vision/Cargo.toml
+cd dolby_vision
+cargo cinstall \
+    --release \
+    --prefix /usr \
+    --destdir "$DESTDIR"
+

extra/libdovi/libdovi.toml

@@ -0,0 +1,23 @@
+[build]
+type = "custom"
+
+[dependencies]
+build = [
+    "cargo-c",
+    "cargo",
+]
+runtime = [
+    "libunwind",
+    "glibc",
+]
+
+[package]
+description = "Library to read and write Dolby Vision metadata"
+homepage = "https://github.com/quietvoid/dovi_tool/tree/main/dolby_vision"
+license = "MIT"
+name = "libdovi"
+version = "3.3.2"
+
+[[source]]
+extract_dir = "$name-$version"
+url = "https://github.com/quietvoid/dovi_tool.git#$name-$version"