Fix readhuditem not parsing flags correctly
Fix unknown word warning erroneously describing the HUD item as a level header

yay icon

This properly links dylibs set during build instead of expecting
the libraries to be in the system path.

UDMF special 502 now must scale arg 2 and 3 in the same scale
space as line length scrolling in binary format. This
is to ensure compatibility with the binary format.

Fixes #862

Co-Authored-By: MascaraSnake <jonassauer27@gmail.com>

Fixes #865

Also clean up redundant "startingspheres" variable

Fixes #71

- Added A_SetShadowScale
- Added A_ShadowScream which combines the above with A_Scream, used for 
badnik explosions
- Gave flickies drop shadows

Turn the console warning into a devmode print because turns out it happens more often than I thought

Some code assumes that P_SpawnMobj can never return NULL
So spawn MT_RAY in it's place when attempting to spawn MT_NULL and show a console warning

This reverts commit b2d693a5.