added a few exceptions rules

the grenade now makes an additional check after the slime extract
reactions occured to see if there are any reagents left in them (meant
for the cases of green and black slime extracts reactions that produce a
new reagent).
the grenade also now repeats its injection checks on the slime extracts
for as many "Uses" they have (default = 1, but extracts enhanced by
slimepsteroid2 can have up to 3).

Yes, this means that a single Ex Grenade can now produce 6 gold slimes
worth of monsters. working as intended.