v0.21.0

**Added**
- (Input) Add support for automatically selecting the emulated controller type based on the physical controller connected to the client
- (Input/Windows) Add support for Applications (context menu) key
- (Input/Windows) Implement touchpad, motion sensors, battery state, and LED control for the emulated DualShock 4 controller
- (Input) Advertise support for new input features to clients
- (Linux/Debian) Added Debian Bookworm package
- (Prep-Commands) Expose connection environment variables
- (Input/Windows) Implement pen and touch support
- (Capture/Windows) Add standalone NVENC encoder
- (Capture) Implement AV1 encoding
- (Network) Implement IPv6 support
- (Capture/Windows) Add option to disable realtime hags
- (Graphics/NVIDIA) Add an option to decrease GPU scheduling priority to workaround HAGS video hang
- (Capture/Linux) Add FFmpeg powerpc64le architecture for self compiling Sunshine
- (Capture/Windows) Add support for capturing rotated displays
- (System Tray) Implement streaming event notifications
- (UI) Add port configuration table
- (Applications) Added option to automatically treat launcher type apps as detached commands
- (Input/Gamepad) Allow the Misc button to work as Guide on emulated Xbox 360 controllers

**Changed**
- (Input) Reduce latency by implementing input batching
- (Logging) Move input packet debug prints off the control stream thread
- (Input) Refactor gamepad emulation code to use DS4 extended report format
- (Graphics/NVIDIA) Modify and restore NVIDIA control panel settings before and after stream, respectively
- (Graphics/NVIDIA) New config page for NVENC
- (Graphics/Windows) Refactor DX shaders
- (Input/Windows) Use our own keycode mapping to avoid installing the US English keyboard layout

**Fixed**
- (UI) Fix update notifications
- (Dependencies/Linux) Replace libboost chrono and thread with standard chrono and thread
- (Input) Increase maximum gamepad limit to 16
- (Network) Allow use of multiple ENet channels
- (Network) Consider link-local addresses on LAN
- (Input) Fixed issue where button may sometimes stick on Windows
- (Input) Fix "ControllerNumber not allocated" warning when a gamepad is removed
- (Input) Fix handling of gamepad feedback with multiple clients connected
- (Input) Fix clamping mouse position to aspect ratio adjusted viewport
- (Graphics/AMD) Fix crash during startup on some older AMD GPUs
- (Logging) Fix crash when non-ASCII characters are logged
- (Prep-Commands) Fix resource exhaustion bug which could occur when many prep commands were used
- (Subprocesses) Fix race condition when inserting new processes
- (Logging) Log error if encoder doesn't produce IDR frame on demand
- (Audio) Improve audio capture logic and logging
- (Logging) Fix AMF logging to match configured log level
- (Logging) Log FFmpeg to log file instead of stdout
- (Capture) Reject codecs that are not supported by display device
- (Capture) Add fallbacks for unsupported codec settings
- (Capture) Avoid probing HEVC or AV1 codecs in some cases
- (Caputre) Remove DwmFlush()
- (Capture/Windows) Improvements to capture sleeps for better frame stability
- (Capture/Windows) Adjust capture rate to better match with display
- (Linux/ArchLinux) Fix package version in PKGBUILD and precompiled package
- (UI) Highlight fatal log messages in web ui
- (Commands) Allow stream if prep command fails
- (Capture/Linux) Fix KMS grab VRAM capture with libva 2.20
- (Capture/macOS) Fix video capture backend
- (Misc/Windows) Don't start the session monitor window when launched in command mode
- (Linux/AppImage) Use the linuxdeploy GTK plugin to correctly deploy GTK3 dependencies
- (Input/Windows) Fix reWASD not recognizing emulated DualShock 4 input

**Dependencies**
- Bump bootstrap from 5.2.3 to 5.3.2
- Bump third-party/moonlight-common-c from c9426a6 to 7a6d12f
- Bump gcc-10 in Ubuntu 20.04 docker image
- Bump furo from 2023.5.20 to 2023.9.10
- Bump sphinx from 7.0.1 to 7.2.6
- Bump cmake from 3.26 to 3.27 in Fedora docker images
- Move third-party/nv-codec-headers from sdk/11.1 branch to sdk/12.0 branch
- Automatic bump ffmpeg
- Bump actions/checkout from 3 to 4
- Bump boost from 1.80 to 1.81 in Macport manifest
- Bump @fortawesome/fontawesome-free from 6.4.0 to 6.4.2

**Misc**
- (Docs) Force badges to use svg
- (Docs) Add Linux SSH example
- (Docs) Add information about mesa for Linux
- (CI) Free additional space on Docker, Flatpak, and AppImage builds due to internal changes on GitHub runners
- (Docs/Logging/UI) Corrected various typos
- (Docs) Add blurb about Gamescope compatibility
- (Installer/Windows) Use system proxy to download ViGEmBus
- (CI) Ignore third-party directory for clang-format
- (Docs/Linux) Add Plasma-Compatible resolution example
- (Docs) Add Sunshine website available at https://app.lizardbyte.dev/Sunshine
- (Build/Windows) Fix audio code build with new MinGW headers
- (Build/Windows) Fix QoS code build with new MinGW headers
- (CI/Windows) Prevent winget action from creating an update when running in a fork
- (CI/Windows) Change winget job to ubuntu-latest runner
- (CI) Add CodeQL analysis
- (CI/Docker) Fix ArchLinux image caching issue
- (Windows) Manifest improvements
- (CI/macOS) Simplify macport build
- (Docs) Remove deprecated options from readthedocs config
- (CI/Docs) Lint rst files
- (Docs) Update localization information (after consolidating Crowdin projects)
- (Cmake) Split CMakelists into modules
- (Docs) Add Linux Headless/SSH Guide