(#3387)

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* Added migrations to change Enumerations to an STI relationship
* Added TimeEntryActivity model (STI)
* Added DocumentCategory model (STI)
* Added IssuePriority model (STI)
* Added Enumeration#get_subclasses to get a list of the subclasses of Enumeration
* Changed Enumeration to use the STI type field instead of the opt field
* Changed Enumeration#opt to return the old opt values but with a deprecation warning.
* Removed Enumeration::OPTIONS
* Removed the dynamic named_scopes in favor of specific named_scopes.  Kept for
  compatibility reasons.
* Added Enumeration#default so each subclass can easily find it's default record.
* Fixed Enumeration#default to use the STI scoping with a fake default scope for finding Enumeration's default.
* Added a 'all' named scope for getting all records in order by position.
* Added Deprecation warnings to the old named_scopes in Enumerations.
* Moved various methods off of Enumeration and onto the concrete classes
* Changed the EnumerationsController to use types
* Updated the Enumeration list template
* Added has_many relationships to the Enumeration STI classes.
* Fixes for tests.

  #3007

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* :controller_messages_new_after_save
* :controller_messages_reply_after_save
* :controller_wiki_edit_after_save

  #3306

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* :view_account_left_bottom
* :view_account_right_bottom

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This can be enabled in permissions settings. A non-admin user who creates a project is automatically added as a project member (the first role is given, TODO: make this given role configurable).
Projects can be added from the public projects list.

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Adds email notification on wiki changes (#413). It's disabled by default and can be enabled in application settings.

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