Flask-rest-engine

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* Add CustomParser for automatically trim leading/trailing whitespace from argument values(`from hobbit_core.webargs import use_args, use_kwargs`).
* Add `HOBBIT_UPPER_SEQUENCE_NAME` config for upper db's sequence name.
* Fixs some err in template.

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* Add `db.BaseModel` for support Oracle id sequence.

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* Add template for 4-layers (view、schema、service、model).
* Add options api for query all consts defined in `app/models/consts`.
* Add `create` command to generate a csv file that defines some models to use in the `gen` command.
* Removed example code.
* Split hobbit cmd and hobbit_core lib, now install cmd should be `pip install "hobbit-core[hobbit,hobbit_core]"`.
* Remove flask_hobbit when import (`hobbit_core.flask_hobbit.db import transaction` --> `from hobbit_core.db import transaction`).
* Enhance gen cmd: now can auto create CRUD API and tests.
* Fix typo.
* Update some test cases.

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* The strict parameter is removed in marshmallow >= 3.0.0.

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* Add import_subs util for auto import models、schemas、views in module/__init__.py file.
* Add index for created_at、updated_at cloumn and default order_by id.
* Add validate for PageParams.
* Add hobbit gen cmd for auto render views.py, models.py, schemas.py etc when start a feature dev.
* Add ErrHandler.handler_assertion_error.
* Add db.transaction decorator, worked either autocommit True or False.
* pagination return dict instead of class, order_by can set None for
* traceback.print_exc() --> logging.error.
* Foreign key fields support ondelete, onupdate.
* Hobbit startproject cmd support celery option.