Rebalance triffids speeds based on mass and features

[AMurkin]

Summary

SUMMARY: Balance "Rebalance triffids speeds based on mass and features"

Purpose of change

Rebalance triffids speeds based on mass and features.
Increase intervals between special_attacks to make it playable.

Describe the solution

Base at 80 kg - 70 speed.
Lower or higher mass, having special_attacks - lower speed.
I did not change the speed of monsters with the flag IMMOBILE.

mass	speed	monster
1 kg	40	sprig
40 kg	50	sprout, fighter (both have special_attacks)
81 kg	70	triffid
120 kg	80	beast (buffed speed due to "alarming speed")
120 kg	40	queen (have special_attacks)

Basic triffid is buffed. Speeds lowered: sprig, queen, vine beast.

special_attacks now have a visible delay.

Describe alternatives you've considered

None.

Testing

9 strength, encumbrance in yellow, naginata in hands.
Aveage survivor now have a chance to kill a triffid heart.
Triffid queen now may walk a bit between casting a GROWPLANTS.
Over rough terrain, their non-plant-like speed is close to that of the survivor.

[sayke]

Why is this necessary? Fast triffids make an interesting challenge. Why should anyone assume that triffids move slower than survivors?

[AMurkin]

Major changes - are slower special_attacks. Now it's really hard for a survivor to pass among trees (GROWPLANTS - Spawns underbrush, or promotes it to > young tree > tree) or root walls (TRIFFID_HEARTBEAT - Grows and crumbles root walls around the player, and spawns more monsters).
They 'grow' with astonishing speed.

Movement speeds are slightly rebalanced to based on something - creature's mass and special attacks.
This change I can drop if needed.