base for challenge system

plugin/src/main/java/com/alttd/cometskyblock/challenges/Challenge.java

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+package com.alttd.cometskyblock.challenges;
+
+import lombok.Getter;
+import org.bukkit.Material;
+import org.bukkit.inventory.ItemStack;
+import org.spongepowered.configurate.objectmapping.ConfigSerializable;
+
+import java.util.List;
+
+@Getter
+@ConfigSerializable
+public class Challenge {
+
+    private String challengeName;
+    private String mySQLKey;
+    private Material shownItem;
+    private ChallengeDifficulty difficulty;
+    private ChallengeType challengeType;
+    private String description;
+    private String neededText;
+    private String rewardText;
+    private String repeatRewardText;
+    private List<ItemStack> rewards;
+    private List<ItemStack> repeatRewards;
+    private List<ItemStack> neededItems;
+    private Integer neededLevel;
+    private Integer slot;
+
+}

plugin/src/main/java/com/alttd/cometskyblock/challenges/ChallengeDifficulty.java

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+package com.alttd.cometskyblock.challenges;
+
+public class ChallengeDifficulty {
+}

plugin/src/main/java/com/alttd/cometskyblock/challenges/ChallengeType.java

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+package com.alttd.cometskyblock.challenges;
+
+import org.spongepowered.configurate.objectmapping.ConfigSerializable;
+
+@ConfigSerializable
+public enum ChallengeType {
+
+    onPlayer,
+    onIsland,
+    islandLevel
+
+}

plugin/src/main/java/com/alttd/cometskyblock/configuration/ChallengesConfiguration.java

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+package com.alttd.cometskyblock.configuration;
+
+import com.alttd.cometskyblock.challenges.Challenge;
+import lombok.Getter;
+import org.spongepowered.configurate.objectmapping.ConfigSerializable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@ConfigSerializable
+@Getter
+@SuppressWarnings({"CanBeFinal", "FieldMayBeFinal"})
+public class ChallengesConfiguration implements Configuration {
+
+    private List<Challenge> challenges = new ArrayList<>();
+}