Add egg logic and hatching screen (WiP) and end biome arena BG

src/data/ability.ts

@@ -1561,7 +1561,7 @@ export function initAbilities() {
     new Ability(Abilities.SAND_STREAM, "Sand Stream", "The Pokémon summons a sandstorm when it enters a battle.", 3)
       .attr(PostSummonWeatherChangeAbAttr, WeatherType.SANDSTORM),
     new Ability(Abilities.PRESSURE, "Pressure", "By putting pressure on the opposing Pokémon, it raises their PP usage.", 3)
-      .attr(PostSummonMessageAbAttr, (pokemon: Pokemon) => getPokemonMessage(pokemon, 'is exerting its Pressure!')),
+      .attr(PostSummonMessageAbAttr, (pokemon: Pokemon) => getPokemonMessage(pokemon, ' is exerting its Pressure!')),
     new Ability(Abilities.THICK_FAT, "Thick Fat", "The Pokémon is protected by a layer of thick fat, which halves the damage taken from Fire- and Ice-type moves.", 3)
       .attr(ReceivedTypeDamageMultiplierAbAttr, Type.FIRE, 0.5)
       .attr(ReceivedTypeDamageMultiplierAbAttr, Type.ICE, 0.5),

src/data/egg.ts

@@ -0,0 +1,23 @@
+import { ModifierTier } from "../modifier/modifier-type";
+
+export const EGG_SEED = 1073741824;
+
+export enum GachaType {
+  LEGENDARY,
+  TYPE,
+  SHINY
+}
+
+export class Egg {
+  public id: integer;
+  public tier: ModifierTier;
+  public gachaType: GachaType;
+  public timestamp: integer;
+
+  constructor(id: integer, gachaType: GachaType, timestamp: integer) {
+    this.id = id;
+    this.tier = Math.floor(id / EGG_SEED);
+    this.gachaType = gachaType;
+    this.timestamp = timestamp;
+  }
+}

src/data/pokemon-species.ts

@@ -2534,7 +2534,7 @@ export const speciesStarters = {
   [Species.WIMPOD]: 3,
   [Species.SANDYGAST]: 3,
   [Species.PYUKUMUKU]: 3,
-  [Species.TYPE_NULL]: 5,
+  [Species.TYPE_NULL]: 6,
   [Species.MINIOR]: 5,
   [Species.KOMALA]: 5,
   [Species.TURTONATOR]: 5,