Frag grenades buff (#20135)

Frag grenades projectiles now apply some agony and eyeblur.
Frag grenades projectiles have damage augmented by 3 points (~10%).
Frag grenades projectiles have an augmented chance of leaving a shrapnel
(+30%).
Frag grenades projectiles have a chance to ricochet up to 2 times.
Some code cleanup and removed some procs that were no longer used
(nothing called them anymore) from the projectile refactor.

code/game/objects/items/weapons/grenades/fragmentation.dm

@@ -32,10 +32,16 @@
 
 //Fragmentation grenade projectile
 /obj/projectile/bullet/pellet/fragment
-	damage = 20
+	damage = 23
+	agony = 20
+	eyeblur = 2
 	armor_penetration = 35
+	embed_chance = 30
 	range_step = 2
 
+	ricochets_max = 2
+	ricochet_chance = 20
+
 	base_spread = 0 //causes it to be treated as a shrapnel explosion instead of cone
 	spread_step = 20