Refactor Spin to MaximumSpinSpeed

Additionally, add descriptions to
other FallsToEarth properties.

mods/ts/rules/defaults.yaml

@@ -945,9 +945,9 @@
 	Tooltip:
 		GenericName: Destroyed Aircraft
 	FallsToEarth:
-		Spins: true
 		Moves: true
 		Velocity: 112
+		MaximumSpinSpeed: 10
 	HitShape:
 
 ^Visceroid:

mods/ts/rules/husks.yaml

@@ -30,8 +30,10 @@ ORCAB.Husk:
 	Tooltip:
 		Name: Orca Bomber
 	Aircraft:
-		TurnSpeed: 5
+		TurnSpeed: 3
 		Speed: 96
+	FallsToEarth:
+		MaximumSpinSpeed: 6
 	RenderSprites:
 		Image: orcab
 	RenderVoxels:
@@ -78,8 +80,10 @@ SCRIN.Husk:
 	Tooltip:
 		Name: Banshee Fighter
 	Aircraft:
-		TurnSpeed: 5
+		TurnSpeed: 3
 		Speed: 168
+	FallsToEarth:
+		MaximumSpinSpeed: 6
 	RenderSprites:
 		Image: scrin
 	RenderVoxels: