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/jack2/jack2.toml

@@ -0,0 +1,45 @@
+[alternatives]
+conflicts = ["pipewire-jack"]
+provides = ["jack"]
+
+[build.flags]
+keep = [ "etc/conf.d/jackd" ]
+
+[build]
+type = "custom"
+
+[dependencies]
+build = [
+    "doxygen",
+    "expat",
+    "waf",
+]
+optional = [
+    "a2jmidid",
+    "realtime-privileges",
+]
+runtime = [
+    "alsa-lib",
+    "db5.3",
+    "dbus",
+    "glibc",
+    "libunwind",
+    "libsamplerate",
+    "libcxx",
+    "opus",
+]
+
+[[manual_sources]]
+files = [ "jack2-1.9.22-db-5.3.patch", "jackd.initd", "jackd.confd", "build.sh" ]
+
+[package]
+description = "The JACK low-latency audio server"
+homepage = "https://github.com/jackaudio/jack2"
+license = "GPL-2.0-or-later"
+name = "jack2"
+version = "1.9.22"
+
+[[source]]
+extract_dir = "$name-$version"
+url = "https://github.com/jackaudio/jack2.git#v$version"
+patches = [ "jack2-1.9.22-db-5.3.patch" ]