Marks Provider

We need marks providers to provide the marks.

Each provider should have a unique prefix. This prefix can only include letters or numbers. Method getPrefix() should return this prefix.

Method getMark(String, MarkRelatedValues) should returns a mark has the key. It could be null if the mark not exist, or the related values decide that the provider shouldn't provide such mark. The manager will pass a key without prefix, so the provider needn't judge it again.

Method getAllMarksKey(MarkRelatedValues) should return all the keys without prefix.