Consider cleaning unused files that only contain commented code
Files:
src/core/accelerator.cpp
src/core/accelerator_decl.hpp
src/core/cachedaccelerator.hpp
src/core/cachedaccelerator_decl.hpp
only contain commented code that is not used anymore. Consider removing those files.
By extension, the forward reference of class accelerator
in file src/core/accelerator_decl.hpp
it's also no longer required.