v25 meta update (#1872)

## Description:

v25 meta update:

- Trade ship spawn rate is determined by number of ports players has and
total number of tradeships on the map
- Train spawn rate scales hyperbolically with number of factories owned
by player
- Factory & Port share the same early unit discount (eg building a port
makes the factory more expensive), this is to encourage more
specialization: become a naval economy or land based economy.
- Trains spawn from factories and arrive on cities
- Trains only give gold on cities
- Trains give 50k gold for allies, 25k for nonallies, and 10k for self
- Large players are given a 30% speed/attack debuff in sigmoid curve
- Reduced attack bonus for large players
- Nerf bot gold production from 1k/s => 500/s
- Nerf bot max troops

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

src/core/execution/PortExecution.ts

@@ -78,7 +78,10 @@ export class PortExecution implements Execution {
 
   shouldSpawnTradeShip(): boolean {
     const numTradeShips = this.mg.unitCount(UnitType.TradeShip);
-    const spawnRate = this.mg.config().tradeShipSpawnRate(numTradeShips);
+    const numPlayerPorts = this.player.unitCount(UnitType.Port);
+    const spawnRate = this.mg
+      .config()
+      .tradeShipSpawnRate(numTradeShips, numPlayerPorts);
     for (let i = 0; i < this.port!.level(); i++) {
       if (this.random.chance(spawnRate)) {
         return true;

src/core/execution/TrainStationExecution.ts

@@ -1,4 +1,4 @@
-import { Execution, Game, Unit } from "../game/Game";
+import { Execution, Game, Unit, UnitType } from "../game/Game";
 import { TrainStation } from "../game/TrainStation";
 import { PseudoRandom } from "../PseudoRandom";
 import { TrainExecution } from "./TrainExecution";
@@ -48,8 +48,10 @@ export class TrainStationExecution implements Execution {
     this.spawnTrain(this.station, ticks);
   }
 
-  private shouldSpawnTrain(clusterSize: number): boolean {
-    const spawnRate = this.mg.config().trainSpawnRate(clusterSize);
+  private shouldSpawnTrain(): boolean {
+    const spawnRate = this.mg
+      .config()
+      .trainSpawnRate(this.unit.owner().unitCount(UnitType.Factory));
     for (let i = 0; i < this.unit!.level(); i++) {
       if (this.random.chance(spawnRate)) {
         return true;
@@ -73,7 +75,7 @@ export class TrainStationExecution implements Execution {
     if (availableForTrade.size === 0) {
       return;
     }
-    if (!this.shouldSpawnTrain(availableForTrade.size)) {
+    if (!this.shouldSpawnTrain()) {
       return;
     }