Update dependencies and improve configuration management

- Updated LoLib dependency to version 3.0.0 in build.gradle.kts
- Added HikariCP and MySQL connector dependencies for improved database handling
- Enhanced jar minimization process to exclude JDBC pool and driver
- Refactored configuration management by introducing ConfigAccessor and ConfigLoader for better file handling and validation
- Removed deprecated GenerationOptions class and integrated its functionality into the new structure
- Improved command error handling and added cooldown hints for admin commands

src/main/java/dev/loki/loparkour/style/RandomStyle.java

@@ -12,17 +12,18 @@ public final class RandomStyle implements Style {
 
     public RandomStyle(String name, List<Material> materials) {
         this.name = name;
-        this.materials = materials;
+        this.materials = (materials == null || materials.isEmpty())
+                ? List.of(Material.STONE)
+                : List.copyOf(materials);
     }
 
     @Override
     public Material getNext() {
         return materials.get(ThreadLocalRandom.current().nextInt(materials.size()));
     }
-
     @Override
     public String getName() {
         return name;
     }
 
-}
+}