Added USE_SPELL_ON_CREATURE command

[AdamPlenty]

It can cast non-shot creature spells on the specified creature.

[Loobinex]

Could you please specify how the command is used?
On this pull I edited it in for you: #930

So:
USE_SPELL_ON_CREATURE([player?],[creature?],?,?,?)

[AdamPlenty]

Could you please specify how the command is used?
On this pull I edited it in for you: #930

So:
USE_SPELL_ON_CREATURE([player?],[creature?],?,?,?)

USE_SPELL_ON_CREATURE([player],[creature],[location],[spell],[spell level])

[Loobinex]

There's a warning the [spell_level] is too low at 0 even when you use it on spells that don't have a level. I think this should probably be valid:
USE_SPELL_ON_CREATURE(PLAYER0,ORC,ANYWHERE,SPELL_REBOUND,0)