Fix compiler warnings and add sandstone to mining sources

- Buff toughness back to pre-recode level

common/src/main/java/dev/aurelium/auraskills/common/api/implementation/OfflineSkillsUser.java

@@ -5,10 +5,14 @@
 import dev.aurelium.auraskills.api.skill.Skill;
 import dev.aurelium.auraskills.api.stat.Stat;
 import dev.aurelium.auraskills.api.stat.StatModifier;
+import dev.aurelium.auraskills.api.trait.Trait;
 import dev.aurelium.auraskills.api.user.SkillsUser;
 import dev.aurelium.auraskills.common.AuraSkillsPlugin;
+import org.jetbrains.annotations.Nullable;
 
+import java.util.HashMap;
 import java.util.Locale;
+import java.util.Map;
 import java.util.UUID;
 
 public class OfflineSkillsUser implements SkillsUser {
@@ -61,6 +65,11 @@ public void setSkillLevel(Skill skill, int level) {
 
     }
 
+    @Override
+    public double getSkillAverage() {
+        return 0;
+    }
+
     @Override
     public double getStatLevel(Stat stat) {
         return 0;
@@ -101,6 +110,26 @@ public void removeStatModifier(String name) {
 
     }
 
+    @Override
+    public @Nullable StatModifier getStatModifier(String name) {
+        return null;
+    }
+
+    @Override
+    public Map<String, StatModifier> getStatModifiers() {
+        return new HashMap<>();
+    }
+
+    @Override
+    public double getEffectiveTraitLevel(Trait trait) {
+        return 0;
+    }
+
+    @Override
+    public double getBonusTraitLevel(Trait trait) {
+        return 0;
+    }
+
     @Override
     public int getAbilityLevel(Ability ability) {
         return 0;

common/src/main/resources/sources/mining.yml

@@ -20,6 +20,9 @@ sources:
   granite:
     block: granite
     xp: 0.2
+  sandstone:
+    block: sandstone
+    xp: 0.2
   coal_ore:
     block: coal_ore
     xp: 1.0

common/src/main/resources/stats.yml

@@ -38,7 +38,7 @@ stats:
     enabled: true
     traits:
       auraskills/damage_reduction:
-        modifier: 0.24
+        modifier: 0.3
   auraskills/crit_chance:
     enabled: true
     traits:

common/src/test/java/dev/aurelium/auraskills/test/env/TestAuraSkills.java

@@ -205,11 +205,6 @@ public EventHandler getEventHandler() {
         return null;
     }
 
-    @Override
-    public <T> T getItemManager(Class<T> itemManagerClass) {
-        return null;
-    }
-
     @Override
     public String getMsg(MessageKey key, Locale locale) {
         return null;