This PR brings probably the biggest change in the history of HyperHDR and complements the previous first part of refactoring #605, which mainly covered the interface. With over +16000/-21000 lines of code changed, the main HyperHDR pillars have also changed so that we can expect even greater program stability in the least expected scenarios thanks to greater control over the life cycle of objects. Overall speed and responsiveness is also improved. In addition, it implements important new features such as MQTT or DirectX hardware acceleration, as well as improved and smoother LED rendering thanks to a unified clock for LED driver and Smoothing processing.

• Windows/DirectX: use hardware acceleration (pixel & vertex shaders) for software capturing. Resolves Windows/DirectX: use hardware acceleration (pixel & vertex shaders) for software capturing #688
• Windows/DirectX: fix overexposed HDR stream with pixel shader. Fixes Windows/DirectX: fix overexposed HDR stream with pixel shader #689
• Windows/DirectX: autodetect HDR mode. Resolves Windows/DirectX: autodetect HDR mode #690
• automatic database backup before applying structure changes when installing new version, json backups are saved in standard HyperHDR configuration home directory
• move almost all main objects management under control of C++ smart pointers, fully control complicated life-cycle and ownership of HyperHDR components
• smoothing clock is integrated directly within led driver: no more two separated & unsynchronized clocks for smoothing and led driver, also much more precise refresh times.
• no definitely/possibly memory leaks from HyperHDR itself reported in valgrind now for base configuration (tested using Linux console OS version)
• HyperHDR driver for WLED has been switched to WLED Audio-Reactive-Led-Strip protocol removing old 490 LEDs limit https://github.com/Aircoookie/WLED/wiki/UDP-Realtime-Control
• relaxed thread synchronization (only where needed), much faster HyperHDR start & exit
• switch libCEC to mainstream since version 6.x is widely available now
• Linux: audio stream auto-resume on EPIPE error
• improved headers including for faster compilation
• JSON API security vulnerability fixed
• add video buffer memory caching to Pipewire grabber
• fixed the LUT calibration page by removing potential scrollbars that could interfere with the final result
• support for Pico (rp2040) boards using HyperSPI
• fix over 500LEDs limit for HyperSPI when RPi5 is used
• improved installers script
• address codeql findings
• fix logging tab that can be empty when opened and add button to copy logs
• ArtNet LED Controller: add toggle to prevent pixel color data split across two artnet universes. Fixes Add toggle to prevent pixel color data split across two artnet universes to support certain ArtNet Controller #657
• Ability to change MQTT Topic. Resolves Ability to change MQTT Topic. #619
• MQTT: auto-resume. Resolves Network issue when powering down #570
• MQTT ability to execute multiply commands in one request. Resolves Support for multiple API commands in one MQTT request #642. eg:

mosquitto_pub -h localhost -t HyperHDR/JsonAPI -m "[{\"command\" : \"instance\",\"subcommand\":\"switchTo\",\"instance\":1},{\"command\":\"componentstate\",\"componentstate\":{\"component\":\"LEDDEVICE\",\"state\": false}}]"

• each MQTT subcommand will return full response in the overall result at HyperHDR/JsonAPI/response
  e.g.

mosquitto_sub -h localhost -t HyperHDR/JsonAPI/response
[{"command":"instance-switchTo","info":{"instance":1},"success":true,"tan":0},{"command":"componentstate","success":true,"tan":0}]