Made calculation of Markers on GuiTimeline dynamic

Changed Real Timeline's Length to 30 minutes (request by multiple users)

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

@@ -4,6 +4,10 @@ import java.text.DecimalFormat;
 
 public class RoundUtils {
 
+    public static int roundToMultiple(int value, int snap) {
+        return Math.max(snap, (int)Math.round((float)value/snap) * snap);
+    }
+
     public static double round2Decimals(double val) {
         return round(val, 2);
     }
@@ -20,4 +24,20 @@ public class RoundUtils {
         return Double.valueOf(df.format(value));
     }
 
+    public static int getClosestInt(int base, int[] snap) {
+        int min = Integer.MAX_VALUE;
+        int closest = base;
+
+        for (int v : snap) {
+            final int diff = Math.abs(v - base);
+
+            if (diff < min) {
+                min = diff;
+                closest = v;
+            }
+        }
+
+        return closest;
+    }
+
 }