GMFX artillery expansion

renames the following:
huge artillery shell -> M795 (155mm HE)
large artillery shell -> M1 (105mm HE)

alters the following:
medium artillery shell:
- renamed to M821
- trajectory altered to match a mortar

small artillery shell:
- renamed to M720A1
- trajectory altered to match a mortar

cluster artillery:
- number of bomblets increased from 16 to 72
- renamed to M864

the following is added to the game:

60mm WP round
produces an explosion, fire, and smoke cloud.

155mm WP shell
modified cluster bomb which produces explosions, fire, and smoke for each bomblet. 

M546 105mm beehive rounds
flechette rounds which dispense 1000 projectiles at a target

122mm BM21 rockets (plus barrage variant)
modified large artillery with a smoke trail.

feel free to dm me on discord @domin8849 if you would like to see this mod supported or would like to provide feedback