Since these can be changed on the placed light actor they have to be read from there, so this is now a pointer in FDynamicLight, just like the other properties that can be user-changed.
Also did some cleanup on the interface so that external code doesn't need to dereference the lightflags pointer but can use utility functions for all flags.
# Conflicts:
# src/hwrenderer/dynlights/hw_dynlightdata.cpp
# src/swrenderer/line/r_walldraw.cpp
# Conflicts:
# src/g_level.cpp
# src/gl/compatibility/gl_20.cpp
The previous version didn't detect some real mistakes in code which used operator& with the wrong flagset (for now 'converted' to the correcly equivalent counterpart, waiting for the proper fix).
