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/gsm/gsm.toml

@@ -0,0 +1,27 @@
+[build]
+type = "custom"
+
+[dependencies]
+runtime = ["glibc"]
+
+[[manual_sources]]
+files = [
+    "gsm-fix-toast-install.patch",
+    "gsm-shared.patch"
+]
+
+[package]
+description = "Shared libraries for GSM 06.10 lossy speech compression"
+homepage = "https://www.quut.com/gsm/"
+license = "LicenseRef-GSM"
+name = "gsm"
+version = "1.0.24"
+
+[[source]]
+extract_dir = "$name-$version"
+patches = [
+    "gsm-fix-toast-install.patch",
+    "gsm-shared.patch"
+]
+sha256 = "a3c40c6471928383f4abfcb2e8f24012a1f562be2f17b8d672145d5986681a92"
+url = "https://www.quut.com/gsm/gsm-$version.tar.gz"