Fix two issues with GL nodes handling

Fix inability to load GL nodes for maps with names longer than 5 characters.
Fix inability to load GL nodes from external GWA files.
Fix incorrect Maulotaur melee attack sound

It was STFHIT instead of STFPOW
- Fixed new[]/delete mismatch in FNodeBuilder

Found with address sanitizer.
Add NOBLOOD flag to Heresiarch actor

Heresiarch entity in vanilla Hexen doesn't spawn blood when hit