* moved the sprite renaming out of the file system entirely into a caller-provided callback.
* renamed several functions to closer match the terms of a file system.
* moved the VM interface out of the implementation.
(The Raven license got removed from sc_man after checking that no Raven code is still present here, this file got a nearly complete overhaul over all those years.)
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.
Script position is now initialized at the very beginning of decorate parsing process
Script position no longer contains uninitialized file name
https://forum.zdoom.org/viewtopic.php?t=64836
