Also fixes type conversions (first time I have tried to convert to a base class and found that my IsChildOf check was the wrong way around).
Plus some extra accessors added for exec/update contexts.
Found the need for these when doing show & tell prep.
#rb Jurre.deBaare
[CL 17367354 by Thomas Sarkanen in ue5-main branch]
Split 'node context' into an 'evaluation context' and a 'node reference' type and updated regular function signatures when creating node functions. This way we can seperate concerns (and potentially reference anim nodes standalone in the future).
Moved function caller code into function ref file to stop AnimNodeBase bloat.
Fixed functions not being called on root nodes.
#rb Jurre.deBaare
[CL 16727107 by Thomas Sarkanen in ue5-main branch]