lmd_force or fix ammo_force

thought:
lmd_force
Modifies how much force a player has

keys:
delay - if set, will repeatedly apply whatever this ent is set to do to a player at these intervals until they die or the time key runs out
count - the force amount, normally force will be set to this
time - how long the entity's effect lasts
targetname

flags:
1- if the amount of force is greater than the maximum, it will slowly return to normal (like health)
2- count key affects the player's max force rather than just how much force the user has then, until they die
4- count key adds (subtracts if negative) rather than just setting the amount of force to whatever the value of the count, key is

or just make ammo_force work again, allow it to use negitive like item_medpak_instant