Add cancellable FactionRelationWishEvent

This event is called before a faction relation wish is applied by a
player using `/f relation`

src/main/java/com/massivecraft/factions/cmd/FRelationCommand.java

@@ -3,6 +3,7 @@ package com.massivecraft.factions.cmd;
 import com.massivecraft.factions.Conf;
 import com.massivecraft.factions.Faction;
 import com.massivecraft.factions.event.FactionRelationEvent;
+import com.massivecraft.factions.event.FactionRelationWishEvent;
 import com.massivecraft.factions.scoreboards.FTeamWrapper;
 import com.massivecraft.factions.struct.Permission;
 import com.massivecraft.factions.struct.Relation;
@@ -50,13 +51,19 @@ public abstract class FRelationCommand extends FCommand {
             return;
         }
 
+        Relation oldRelation = myFaction.getRelationTo(them, true);
+        FactionRelationWishEvent wishEvent = new FactionRelationWishEvent(fme, myFaction, them, oldRelation, targetRelation);
+        Bukkit.getPluginManager().callEvent(wishEvent);
+        if (wishEvent.isCancelled()) {
+            return;
+        }
+
         // if economy is enabled, they're not on the bypass list, and this command has a cost set, make 'em pay
         if (!payForCommand(targetRelation.getRelationCost(), TL.COMMAND_RELATIONS_TOMARRY, TL.COMMAND_RELATIONS_FORMARRY)) {
             return;
         }
 
         // try to set the new relation
-        Relation oldRelation = myFaction.getRelationTo(them, true);
         myFaction.setRelationWish(them, targetRelation);
         Relation currentRelation = myFaction.getRelationTo(them, true);
         ChatColor currentRelationColor = currentRelation.getColor();

src/main/java/com/massivecraft/factions/event/FactionRelationWishEvent.java

@@ -0,0 +1,44 @@
+package com.massivecraft.factions.event;
+
+import com.massivecraft.factions.FPlayer;
+import com.massivecraft.factions.Faction;
+import com.massivecraft.factions.struct.Relation;
+import org.bukkit.event.Cancellable;
+
+public class FactionRelationWishEvent extends FactionPlayerEvent implements Cancellable {
+    private final Faction targetFaction;
+    private final Relation currentRelation;
+    private final Relation targetRelation;
+
+    private boolean cancelled;
+
+    public FactionRelationWishEvent(FPlayer caller, Faction sender, Faction targetFaction, Relation currentRelation, Relation targetRelation) {
+        super(sender, caller);
+
+        this.targetFaction = targetFaction;
+        this.currentRelation = currentRelation;
+        this.targetRelation = targetRelation;
+    }
+
+    public Faction getTargetFaction() {
+        return targetFaction;
+    }
+
+    public Relation getCurrentRelation() {
+        return currentRelation;
+    }
+
+    public Relation getTargetRelation() {
+        return targetRelation;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancelled) {
+        this.cancelled = cancelled;
+    }
+}