D features in declare_dependency

declare_dependencyaccepts parameters for D specific features. Accepted new parameters are d_module_features and d_import_dirs.

This can be useful to propagate conditional compilation versions. E.g.:

my_lua_dep = declare_dependency(
    # ...
    d_module_features: ['LUA_53'],
    d_import_dirs: include_directories('my_lua_folder'),
)