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/libmysofa/libmysofa.toml

@@ -0,0 +1,33 @@
+[build]
+type = "cmake"
+
+[build.flags]
+build_dir = "build"
+configure = [
+    "-G Ninja",
+    "-DCODE_COVERAGE=OFF",
+    "-DBUILD_TESTS=OFF",
+    "-Wno-dev",
+    "-DCMAKE_POLICY_VERSION_MINIMUM=3.5"
+]
+make-test-vars = [ "-j1" ]
+
+[dependencies]
+build = [
+    "cmake",
+    "cunit",
+    "ninja"
+]
+runtime = ["zlib-ng"]
+test = ["nodejs"]
+
+[package]
+description = "C library to read HRTFs if they are stored in the AES69-2015 SOFA format"
+homepage = "https://github.com/hoene/libmysofa"
+license = "BSD-3-Clause"
+name = "libmysofa"
+version = "1.3.4"
+
+[[source]]
+extract_dir = "$name-$version"
+url = "https://github.com/hoene/libmysofa.git#v$version"