* adds NewCompensationForm content and functionality
* renames CODELIST_COMPENSATION_COMBINATION_ID into CODELIST_COMPENSATION_FUNDING_ID for more clarity
* reorganizes compensation forms into compensation/forms/forms.py and forms/modalForms.py
* adds new compensation html template in compensation/templates/compensation/new
* adds new default message template in message_templates.py: IDENTIFIER_REPLACED
* adds/updates translations
* refactors documents and file upload to be distributed into different subfolders, depending on the type of document (InterventionDocument, RevocationDocument, ...)
* refactors Document model into AbstractDocument
* subclasses RevocationDocument, InterventionDocument, COmpensationDocument, EmaDocument and EcoAccountDocument from AbstractDocument to provide proper functionality for each
* adds new specialized routes for each new document type (opening, removing)
* drops generic get and remove routes for documents