!Added method to StatInstance to easily register temp stats

src/main/java/net/Indyuce/mmocore/api/player/stats/PlayerStats.java

@@ -6,6 +6,7 @@ import java.util.Set;
 
 import net.Indyuce.mmocore.api.player.PlayerData;
 import net.Indyuce.mmocore.api.player.stats.stat.modifier.StatModifier;
+import net.Indyuce.mmocore.api.player.stats.stat.modifier.TemporaryStatModifier;
 
 public class PlayerStats {
 	private final PlayerData data;
@@ -101,6 +102,10 @@ public class PlayerStats {
 			addModifier(key, new StatModifier(value));
 		}
 
+		public void applyTemporaryModifier(String key, StatModifier modifier, long duration) {
+			addModifier(key, new TemporaryStatModifier(modifier.getValue(), duration, modifier.isRelative(), key, this));
+		}
+
 		public void addModifier(String key, StatModifier modifier) {
 			map.put(key, modifier);
 

src/main/java/net/Indyuce/mmocore/api/player/stats/stat/modifier/StatModifier.java

@@ -8,7 +8,6 @@ public class StatModifier {
 	private final double d;
 	private final boolean relative;
 
-
 	public StatModifier(double d) {
 		this(d, false);
 	}
@@ -33,6 +32,10 @@ public class StatModifier {
 	public boolean isRelative() {
 		return relative;
 	}
+	
+	public double getValue() {
+		return d;
+	}
 
 	public double apply(double in) {
 		return relative ? in * (1 + d / 100) : in + d;

src/main/java/net/Indyuce/mmocore/api/player/stats/stat/modifier/TemporaryStatModifier.java

@@ -7,7 +7,7 @@ import net.Indyuce.mmocore.api.player.stats.PlayerStats.StatInstance;
 
 public class TemporaryStatModifier extends StatModifier {
 	private final BukkitRunnable runnable;
-
+	
 	public TemporaryStatModifier(double d, long duration, boolean relative, String key, StatInstance ins) {
 		super(d, relative);