Code householding (PlayerListener / Settings)

- Use field on PlayerListener for storing nickname pattern -> repeatedly parsing pattern is expensive
- Remove unused legacy setting fields
- ForceFlatToSqlite cannot be run from converter command -> remove Converter interface to create more natural method signatures

src/test/java/fr/xephi/authme/converter/ForceFlatToSqliteTest.java

@@ -54,7 +54,7 @@ public class ForceFlatToSqliteTest {
         ForceFlatToSqlite converter = new ForceFlatToSqlite(flatFile, dataSource);
 
         // when
-        converter.execute(null);
+        converter.run();
 
         // then
         ArgumentCaptor<PlayerAuth> authCaptor = ArgumentCaptor.forClass(PlayerAuth.class);

src/test/java/fr/xephi/authme/listener/ListenerConsistencyTest.java

@@ -106,7 +106,11 @@ public final class ListenerConsistencyTest {
         // Exclude any methods with "$" in it: jacoco creates a "$jacocoInit" method we want to ignore, and
         // methods like "access$000" are created by the compiler when a private member is being accessed by an inner
         // class, which is not of interest for us
-        return !Modifier.isPrivate(method.getModifiers()) && !method.getName().contains("$");
+        if (Modifier.isPrivate(method.getModifiers()) || method.getName().contains("$")) {
+            return false;
+        }
+        // Skip reload() method (implementation of Reloadable interface)
+        return !"reload".equals(method.getName()) || method.getParameterTypes().length > 0;
     }
 
 }