Made GuiDraggingNumberInput fully functional

Linked GuiObjectManager to new Keybinding
Renamed RoundUtils#round to RoundUtils#round2Decimals for easier understanding

src/main/java/eu/crushedpixel/replaymod/utils/RoundUtils.java

@@ -2,6 +2,6 @@ package eu.crushedpixel.replaymod.utils;
 
 public class RoundUtils {
 
-    public static double round(double val) { return Math.round(val*100.0) / 100.0; }
+    public static double round2Decimals(double val) { return Math.round(val*100.0) / 100.0; }
 
 }