Update to Minecraft 1.21.8, add checkstyle, fix compilation errors

- Update Paper API: 1.20.1 -> 1.21.4
- Update plugin version: 1.5.5-1.20.1 -> 1.5.5-1.21.8
- Add checkstyle plugin with reasonable rules
- Fix Enchantment.LUCK -> Enchantment.UNBREAKING
- Fix EntityType.FIREWORK -> EntityType.FIREWORK_ROCKET
- Remove unused imports
- Add temp_*/ to .gitignore
- 118 files changed, 1633 insertions(+), 1301 deletions(-)

src/main/java/com/loki/lochat/commands/MsgCommand.java

@@ -5,6 +5,7 @@ import com.loki.lochat.api.service.IgnoreService;
 import com.loki.lochat.api.service.PMService;
 import com.loki.lochat.api.service.SpyService;
 import com.loki.lochat.utils.ChatFormatter;
+import com.loki.lochat.utils.PlayerUtil;
 import org.bukkit.Bukkit;
 import org.bukkit.Sound;
 import org.bukkit.command.Command;
@@ -89,10 +90,10 @@ public class MsgCommand implements CommandExecutor {
 
         // Звук для получателя
         if (plugin.getConfigManager().isPmSoundEnabled()) {
-            try {
-                Sound sound = Sound.valueOf(plugin.getConfigManager().getPmSoundType());
+            Sound sound = PlayerUtil.parseSound(plugin.getConfigManager().getPmSoundType(), null);
+            if (sound != null) {
                 target.playSound(target.getLocation(), sound, 1.0f, 1.0f);
-            } catch (IllegalArgumentException ignored) {}
+            }
         }
 
         // Шпион