* refactors 'new' view methods into classes for eiv and ema
* refactors 'edit' view methods into classes for eiv and ema
* reorganizes permissions on non-conservation-office users on ema entries
* users can now open the log view properly if they have shared access
* ema actions that require conservation office permission are now hidden on the frontend for non-conservation-office users
* adds team sharing field to share form
* splits sharing logic into user based and teams based
* adds TeamAdmin for admin backend
* adds validity check on Team name -> only unused names shall be valid
* renames model ResponsibilityData into Responsibility
* renames model LegalData into Legal
* moves form->object saving logic into model
* refactors NewDocumentForm into special types for intervention, compensation, eco account and ema
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