Moved around more static methods, nothing final

Some of these are "incorrect" - I wanted to decrease the # of static classes first by grouping them if they're slightly related.
Then I'll do a second pass in each class to reorganize later.

client/src/main/java/rt4/DeadClass.java

@@ -0,0 +1,11 @@
+package rt4;
+
+import org.openrs2.deob.annotation.OriginalMember;
+
+// Has no usages.
+
+public final class DeadClass {
+
+	@OriginalMember(owner = "client!ul", name = "I", descriptor = "Lclient!gn;")
+	public static final LruHashTable cache = new LruHashTable(4);
+}