Replace the Qt Meta-Object Compiler (moc) with native C+26 reflection capabilities to be able to support C+20 modules.

Possible challenges:

• Toolchain support: C++26 reflection not yet widely available in production compilers
• Build system integration: CMake, qmake, and other build systems need updates to remove moc dependencies
• Legacy code migration: Existing Q_OBJECT macros need migration path to reflection-based equivalents
• Feature parity: Ensuring all current moc features work with reflection
• Standard compliance: Waiting for stable C++26 reflection specification
• Ecosystem compatibility: Third-party tools and libraries that depend on moc-generated files

Components requiring reflection support:

• Enum to string conversion (Q_ENUM/Q_FLAG)
• Signal/slot mechanism (connect(), emit, Q_SIGNAL, Q_SLOT)
• Property system (Q_PROPERTY with READ/WRITE/NOTIFY)
• Meta-method invocation (QMetaObject::invokeMethod)
• Object introspection (QMetaObject, property enumeration)
• Class information (Q_CLASSINFO)
• Invokable registration (Q_INVOKABLE constructors)
• Interface declarations (Q_INTERFACE)
• Namespace meta-objects (Q_NAMESPACE)
• Plugin metadata (Q_PLUGIN_METADATA)
• QML integration (QML_ELEMENT)
• Property bindings (BINDABLE properties)

See also:

• QTBUG-86697: C++23 moc modules support
• Bloomberg C++26 reflection implementation: https://github.com/bloomberg/clang-p2996
• Verdigris library as proof-of-concept: https://github.com/woboq/verdigris