Gacha rework

Add fallback stripping and C6 stripping
Converting banner definitions from pity vars to lerp arrays
Properly implement rates and pool smoothing
Also move reusable functions to Utils

src/main/java/emu/grasscutter/game/gacha/PlayerGachaBannerInfo.java

@@ -7,6 +7,11 @@ public class PlayerGachaBannerInfo {
 	private int pity5 = 0;
 	private int pity4 = 0;
 	private int failedFeaturedItemPulls = 0;
+	private int failedFeatured4ItemPulls = 0;
+	private int pity5Pool1 = 0;
+	private int pity5Pool2 = 0;
+	private int pity4Pool1 = 0;
+	private int pity4Pool2 = 0;
 	
 	public int getPity5() {
 		return pity5;
@@ -32,15 +37,82 @@ public class PlayerGachaBannerInfo {
 		this.pity4 += amount;
 	}
 	
-	public int getFailedFeaturedItemPulls() {
-		return failedFeaturedItemPulls;
+	public int getFailedFeaturedItemPulls(int rarity) {
+		return switch (rarity) {
+			case 4 -> failedFeatured4ItemPulls;
+			default -> failedFeaturedItemPulls;  // 5
+		};
 	}
 	
-	public void setFailedFeaturedItemPulls(int failedEventCharacterPulls) {
-		this.failedFeaturedItemPulls = failedEventCharacterPulls;
+	public void setFailedFeaturedItemPulls(int rarity, int amount) {
+		switch (rarity) {
+			case 4 -> failedFeatured4ItemPulls = amount;
+			default -> failedFeaturedItemPulls = amount;  // 5
+		};
 	}
 	
-	public void addFailedFeaturedItemPulls(int amount) {
-		failedFeaturedItemPulls += amount;
+	public void addFailedFeaturedItemPulls(int rarity, int amount) {
+		switch (rarity) {
+			case 4 -> failedFeatured4ItemPulls += amount;
+			default -> failedFeaturedItemPulls += amount;  // 5
+		};
+	}
+	
+	public int getPityPool(int rarity, int pool) {
+		return switch (rarity) {
+			case 4 -> switch (pool) {
+				case 1 -> pity4Pool1;
+				default -> pity4Pool2;
+			};
+			default -> switch (pool) {
+				case 1 -> pity5Pool1;
+				default -> pity5Pool2;
+			};
+		};
+	}
+	
+	public void setPityPool(int rarity, int pool, int amount) {
+		switch (rarity) {
+			case 4:
+				switch (pool) {
+					case 1 -> pity4Pool1 = amount;
+					default -> pity4Pool2 = amount;
+				};
+				break;
+			case 5:
+			default:
+				switch (pool) {
+					case 1 -> pity5Pool1 = amount;
+					default -> pity5Pool2 = amount;
+				};
+				break;
+		};
+	}
+	
+	public void addPityPool(int rarity, int pool, int amount) {
+		switch (rarity) {
+			case 4:
+				switch (pool) {
+					case 1 -> pity4Pool1 += amount;
+					default -> pity4Pool2 += amount;
+				};
+				break;
+			case 5:
+			default:
+				switch (pool) {
+					case 1 -> pity5Pool1 += amount;
+					default -> pity5Pool2 += amount;
+				};
+				break;
+		};
+	}
+
+	public void incPityAll() {
+		pity4++;
+		pity5++;
+		pity4Pool1++;
+		pity4Pool2++;
+		pity5Pool1++;
+		pity5Pool2++;
 	}
 }