Rebalance the Tempest and the Atlantis (FAForever#6235)

## Changes to the Tempest
**Oblivion Cannon**
Damage: 8000 --> 10000
RateOfFire: 0.1 --> 0.08
DPS: 800 (unchanged)

**Harmonic Depth Charges**
MaxRadius: 80 --> 65
RateOfFire: 0.2 --> 0.1667 (once every 5 seconds --> once every 6
seconds)
DPS: 420 --> 350

**Veterancy**
VeteranMassMult: 0.5 --> 0.75 (mass required to vet: 12k --> 18k)

## Changes to the Atlantis

**Physics**
TurnRate: 12 --> 18

**Veterancy**
VeteranMassMult: 0.5 --> 0.75 (mass required to vet: 6k --> 9k)

## Explanation of the changes
The Tempest gets a nerf, as it has become too oppressive. 

- Its main cannon gains higher damage at the cost of a lower fire rate,
to decrease its effectiveness against destroyers.
- Its Harmonic Depth Charges are extremely powerful and make pushing
Tempests with lower tier units difficult. They are toned down to enable
players to seek the initiative more and punish bad micro.
- Part of the reason the Tempest snowballed as hard as it did, is its
low `VeteranMassMult` stat. A regular battleship needs `11.25k` mass to
vet, the Tempest needed `12k`. Due to its higher mass cost, the Tempest
requires a lower multiplier, though its previous value of `0.5` was too
low.
- Microing the Atlantis is made more rewarding in exchange for getting a
similar nerf to its `VeteranMassMult` stat as the Tempest.

## Checklist
- [x] Changes are documented in the changelog for the next game version

changelog/snippets/balance.6235.md

@@ -0,0 +1,11 @@
+- (#6235) Tone down the Tempest, as it has become too oppressive and snowballed too quickly. Most importantly, its extremely powerful depth charges now fire once every 6 seconds instead of once every 5 seconds and have a reduced range. Additionally, the amount of mass required for it to attain one level of veterancy is increased from 12k to 18k.
+    - Tempest: Experimental Battleship (UAS0401):
+        - Oblivion Cannon Damage: 8000 --> 10000
+        - Oblivion Cannon RateOfFire: 0.1 --> 0.08
+        - Harmonic Depth Charge MaxRadius: 80 --> 65
+        - Harmonic Depth Charge RateOfFire: 0.2 --> 0.1667
+        - Harmonic Depth Charge DPS: 420 --> 350
+        - VeteranMassMult: 0.5 --> 0.75
+    - Atlantis: Experimental Aircraft Carrier (UES0401):
+        - TurnRate: 12 --> 18
+        - VeteranMassMult: 0.5 --> 0.75

units/UAS0401/UAS0401_unit.bp

@@ -258,7 +258,7 @@ UnitBlueprint{
         Level4 = 128,
         Level5 = 160,
     },
-    VeteranMassMult = 0.5,
+    VeteranMassMult = 0.75,
     Weapon = {
         {
             AboveWaterTargetsOnly = true,
@@ -270,7 +270,7 @@ UnitBlueprint{
             },
             BallisticArc = "RULEUBA_LowArc",
             CollideFriendly = false,
-            Damage = 8000,
+            Damage = 10000,
             DamageRadius = 5,
             DamageType = "Normal",
             DisplayName = "Oblivion Cannon",
@@ -304,7 +304,7 @@ UnitBlueprint{
             RackSalvoSize = 1,
             RackSlavedToTurret = false,
             RangeCategory = "UWRC_DirectFire",
-            RateOfFire = 10/100, --10/integer interval in ticks
+            RateOfFire = 10/125, --10/integer interval in ticks
             SlavedToBody = false,
             TargetPriorities = {
                 "NAVAL MOBILE",
@@ -344,7 +344,7 @@ UnitBlueprint{
             },
             FiringTolerance = 2,
             Label = "Torpedo01",
-            MaxRadius = 80,
+            MaxRadius = 65,
             MuzzleSalvoDelay = 0,
             MuzzleSalvoSize = 6,
             MuzzleVelocity = 20,
@@ -371,7 +371,7 @@ UnitBlueprint{
             RackSalvoSize = 1,
             RackSlavedToTurret = false,
             RangeCategory = "UWRC_AntiNavy",
-            RateOfFire = 10/50, --10/integer interval in ticks
+            RateOfFire = 10/60, --10/integer interval in ticks
             TargetPriorities = {
                 "SUBMERSIBLE",
                 "(STRUCTURE * DEFENSE - ANTIAIR)",

units/UES0401/UES0401_unit.bp

@@ -272,7 +272,7 @@ UnitBlueprint{
         SkirtSizeX = 2,
         SkirtSizeZ = 24,
         TurnRadius = 40,
-        TurnRate = 12,
+        TurnRate = 18,
     },
     SelectionSizeX = 1.62,
     SelectionSizeZ = 11.52,
@@ -296,7 +296,7 @@ UnitBlueprint{
         Level4 = 120,
         Level5 = 150,
     },
-    VeteranMassMult = 0.5,
+    VeteranMassMult = 0.75,
     Weapon = {
         {
             Audio = {