Implement and enhance HDR detection and classification across services

[DimitarCC]

This pull request introduces software-based HDR (High Dynamic Range) detection for select set-top boxes, enabling the system to analyze HEVC video streams and determine HDR type (e.g., HDR10, HLG) via bitstream parsing. The implementation includes new C++ modules for parsing and detecting HDR from live DVB streams, integration with the build system for supported devices, and enhancements to the Python ServiceInfo converter to expose HDR-related properties.

Key changes are grouped by theme below:

Build System & Platform Support

• Added detection and conditional build support for software HDR detection in configure.ac and lib/service/Makefile.inc, enabled for VU+ 4K and GigaBlue Quad 4K Pro boxes. This ensures the new HDR detection code is only built and used on capable hardware. [1] [2] [3]

Core HDR Detection Implementation (C++ side)

• Introduced new C++ modules: hevc_hdr.cpp/h for HEVC bitstream parsing and HDR classification, and hdrdetector.cpp/h for live DVB stream HDR detection using a TS recorder tap. These modules extract and classify HDR information from video streams. [1] [2] [3] [4]
• Updated servicedvb.cpp to integrate the HDR detector for live DVB playback, initializing and managing the detector as part of the service play pipeline. [1] [2]
• Added a new enum value sHDRType in iservice.h to represent the detected HDR type in the service information interface.

Python API Enhancements

• Extended the ServiceInfo converter in ServiceInfo.py to support new HDR-related properties (e.g., HDRType, IsHDR10File, IsHLGFile, IsDVFile, IsAnyHDRFile, IsHDRGenericFile). These properties are now available for UI and plugin use. [1] [2]
• Implemented logic in the converter to query and interpret HDR type from the new C++ detector, including fallback to legacy gamma detection if needed, and to expose these results as booleans or values. [1] [2] [3]

Overall, this PR provides robust, software-based HDR detection for supported hardware, exposes detailed HDR information to the Python layer, and ensures the feature is only enabled where it is fully supported.