Added Api to get tile MinPlane (RSClass Method was already named "getPhysicalLevel", so i have kept that name).

runelite-api/src/main/java/net/runelite/api/Tile.java

@@ -101,6 +101,16 @@ public interface Tile extends TileObject
 	 */
 	int getRenderLevel();
 
+	/**
+	 * Get the minimum plane this tile will be rendered on.
+	 * Example: This tile is on plane 1. The local player is on plane 0, and hide roofs option is turned on.
+	 * If minPlane is 0, this tile will not be rendered.
+	 * If minPlane is 1, this tile will be rendered.
+	 *
+	 * @return the minPlane
+	 */
+	int getPhysicalLevel();
+
 	/**
 	 * Computes and returns whether this tile has line of sight to another.
 	 *