Don't set a hook for customeditor if Semantic Forms is used
Use links to File (instead of Page) namespace to generate pagination

- Add function getLinksToFileNamespace to class ProofreadIndexPage
- Alter function buildPaginationForIndexPage in class PaginationFactory
Handle several Proofread versions based on the same page files

- Expects / + transcription ID at the end of the title of ProofreadIndex pages and ProofreadPage pages