This commit refactors the Debug Adapter Protocol (DAP) engine
to separate the logic for CMake-based projects and Gdb-based
debugging.
- Moved CMake-specific code to a new CMakeDAPEngine class
- Moved Gdb-specific code to a new GdbDAPEngine class
Change-Id: Ia616e7b7ea2ff2071bcadd26b28b620f9aca6ac4
Reviewed-by: hjk <hjk@qt.io>