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pullrequests: introduce "action objects" for PR creation
Inspired by the command design pattern, this attempts the following:
* move policy and business logic from controllers into the model,
* move validation, authorization and execution logic closer together in
the code,
* establish a reusable pattern for modelling higher-level concepts
(like "create a new PR iteration"),
* make error handling more well-defined, and independent of the
controller layer, and
* provide clear separation between, one one hand, the validation and
authorization of a request, and on the other, the actual execution.
Inspired by the command design pattern, this attempts the following:
* move policy and business logic from controllers into the model,
* move validation, authorization and execution logic closer together in
the code,
* establish a reusable pattern for modelling higher-level concepts
(like "create a new PR iteration"),
* make error handling more well-defined, and independent of the
controller layer, and
* provide clear separation between, one one hand, the validation and
authorization of a request, and on the other, the actual execution.