…he current Tenant ID

…ession - a wrapper on 'IAsyncDocumentSession' (WIP, tests fail)

 - added a parameter to throw exceptions on wrong tenants
 - refined the methods and properties
 - added comments
 - added tests

…tSession`.

- Changed rules around waiting on saving -  now `AsyncTenantedDocumentSession` manages them all.
- Flag to update the indexes on connecting to DB is now in `appsettings.json`. Removed `DbStartupTask`.
- Removed `RegisterModules`. Now all dependencies are registered in a similar way via `AddAndConfigureBla.cs`.
- Registering Databases dependencies is in the Domain project. The API & Importer projs doesn't touch it.

…cords to tenanted.

Added a 'Project' entity

…ules

…used adding additional logic:

 - ExistsAsync()
 - SaveChangesAsync(boolean)
 - Patch(...) & PatchWithoutValidation(...)

# Conflicts:
#	back-end/Domain/BacklogItemServices/Commands/BacklogItemDtoToEntityConversion.cs