Unique RNG namespace for client-side effects and HUDs. Identifiers for these cannot clash with identifiers that affect the playsim making them completely safe to use in HUD elements. They also won't be saved.
It always reused the previous content of the 'Pos' field which was either undefined or an older position where the actor was located when last spawning a light.
These were creating dangerous interdependencies. It is better to do explicit conversions when needed.
As an added plus, this means that zstring.h no longer depends on name.h which was very annoying.
Many had leftover non-default constructors/ assignment operators, and some were initialized, even though the initialized data was never used.
In case of FCycler this even caused a default setting to be overwritten when used inside FDynamicLight.
They are attached and actived explicitly during usual actor initialization sequence
Postponed processing applicable to so called user dynamic lights must be skipped for them
RECREATELIGHTS flag handling for dynamic light actors had the opposite effect of deactivating them
https://forum.zdoom.org/viewtopic.php?t=65683
This was only run on a state change and missed every external light change.
Any place which wants to flag a light change now only will set a flag and at the end of the thinker loop all flagged actors will be processed.
For performance reasons this was merged with the P_RunEffects iterator loop.
