Refactor texture flipping logic

Moved texture group check to a utility function in `UT.java` to enhance readability and maintainability. Introduced a static `HashSet` in `CS.java` for texture groups that require flipping, replacing hardcoded strings.

Author: ICaxapI

src/main/java/gregapi/data/CS.java

@@ -2326,4 +2326,11 @@ public static class SFX {
 
 	, RES_PATH_IC2              = MD.IC2.mID.toLowerCase() + ":"
 	;
+
+	public static final HashSet<String> SHOULD_FLIP_NEG_Y_TEXTURES = new HashSet<>();
+
+	static {
+		SHOULD_FLIP_NEG_Y_TEXTURES.add("machines");
+		SHOULD_FLIP_NEG_Y_TEXTURES.add("overlays");
+	}
 }

src/main/java/gregapi/render/ITexture.java

@@ -20,6 +20,7 @@
 package gregapi.render;
 
 import static gregapi.data.CS.*;
+import static gregapi.util.UT.shouldFlipNegYTextures;
 
 import org.lwjgl.opengl.GL11;
 
@@ -292,8 +293,7 @@ public static void renderFixedNegativeYFacing(IIcon aIcon, RenderBlocks aRendere
 		//  double tMaxZ1 = aIcon.getInterpolatedV(aRenderer.renderMinZ * 16.0);
 		//  double tMinZ1 = aIcon.getInterpolatedV(aRenderer.renderMaxZ * 16.0);
 
-			String textureGroup = aIcon.getIconName().substring(aIcon.getIconName().indexOf(":") + 1, aIcon.getIconName().indexOf("/"));
-			boolean shouldFlipTexture = aChangedBlockBounds && (textureGroup.equals("machines") || textureGroup.equals("overlays")); // dirty hack, but works fine
+			boolean shouldFlipTexture = shouldFlipNegYTextures(aIcon.getIconName(), aChangedBlockBounds);
 
 			double tMaxX1 = aIcon.getInterpolatedU(aRenderer.renderMaxX * 16.0);
 			double tMinX1 = aIcon.getInterpolatedU(aRenderer.renderMinX * 16.0);

src/main/java/gregapi/util/UT.java

@@ -3568,4 +3568,14 @@ public static boolean finish() {
 			return F;
 		}
 	}
+
+	public static boolean shouldFlipNegYTextures(String textureName, boolean aChangedBlockBounds){
+		int start = textureName.indexOf(":");
+		int stop = textureName.indexOf("/");
+		if (start != -1 && stop != -1) {
+			String textureGroup = textureName.substring(start + 1, stop);
+			return aChangedBlockBounds && (SHOULD_FLIP_NEG_Y_TEXTURES.contains(textureGroup)); // dirty hack, but works fine
+		}
+		return false;
+	}
 }