Create lightweight plugin_action_scope.h containing only the enum class.
Replace #include <api/api_plugin.h> in eda_draw_frame.h with the new
header and a forward declaration of PLUGIN_ACTION.
This removes transitive includes wx/bmpbndl.h, wx/filename.h and
nlohmann/json_fwd.hpp from 79 TUs.
Seth Hillbrand
d45f46a900