Mammoth Tank buff; balance stick for MLRS

Mammoth tank buffed, since people said it was too slow and died easily, e.g. dying too readily while approaching enemy through artillery fire.
-HP increased from 600 to 800. Seems justifiable since it's an expensive, slow-to-build, top-tier unit.
-Speed increased from 3 to 4; (C&C 95 default value, incidentally)
-Rotation reduced from 5 to 3 so that it has a flavor of slowness, and a vulnerability.

MLRS speed reduced from 8 to 7, so it's not uncatchable when retreating.
MLRS health reduced from 120 to 115 so Rocket Bike can kill it in 5 shots instead of 6.
MLRS InitialStance set to Defend, to help noobs avoid unintentionally bunching them up (and making them vulnerable to airstrikes, etc.) and to require less micro-management of their positions.

mods/cnc/rules/vehicles.yaml

@@ -393,9 +393,10 @@ HTNK:
 		Owner: gdi
 	Mobile:
 		Crushes: wall, heavywall, crate, infantry
-		Speed: 3
+		Speed: 4
+		ROT: 3
 	Health:
-		HP: 600
+		HP: 800
 	Armor:
 		Type: Heavy
 	RevealsShroud:
@@ -441,9 +442,9 @@ MSAM:
 		Prerequisites: hq
 		Owner: gdi
 	Mobile:
-		Speed: 8
+		Speed: 7
 	Health:
-		HP: 120
+		HP: 115
 	Armor:
 		Type: Light
 	RevealsShroud:
@@ -495,6 +496,7 @@ MLRS:
 	AttackTurreted:
 	RenderUnitTurretedAim:
 	AutoTarget:
+		InitialStance: Defend
 	DebugRetiliateAgainstAggressor:
 	DebugNextAutoTargetScanTime:
 	Explodes: