base api refactoring and javadocs

omega-config-base/src/main/java/draylar/omegaconfig/api/Comment.java

@@ -5,6 +5,13 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+/**
+ * Represents a description on a config entry.
+ *
+ * <p>
+ * When a configuration is serialized, any field elements with the {@link Comment} annotation
+ *  will be prefixed with a // comment on the previous line, with the value specified by this annotation.
+ */
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.FIELD)
 public @interface Comment {