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Merge #1000

1000: WIP: Add support for other numerical types at the registry level r=hgrecco a=hgrecco

Until this commit, `int` and `float` were special types in Pint
(just as they are in Python). Numbers were parsed from strings
as int/float from the definition files and from user provided
strings; and exponents of units were also stored as int/float.

This commit change this by adding a new argument (`non_int_type`)
to classes and methods. It indicates how numeric values will be parsed
and defaulted. Any numerical class can be used such as `float` (default),
Decimal, Fraction.

This argument will be found in the following places
1. UnitRegistry: used for parsing the definition files and any 
  value provided as a string. 
2. UnitsContainer: used to compare equality with strings, multiply and
  divide by strings (which is equivalent to parse the string)
3. All methods OUTSIDE the UnitRegistry/Quantity that can parse
   strings have a `non_int_type` argument. (e.g. Definition.from_string)

Tests have been added for by duplicating most cases in `test_quantity.py`.
(Some tests have been deleted such as those dealing with numpy.)
The new file `test_non_int.py` run the tests for `Decimal`, `Fraction` and
`float` (which is redundant but is kept as a crosscheck for the implementation
of this testsuite)

BREAKING CHANGE: `use_decimal` is deprecated. 
Use `non_int_type` keyword argument when instantiating the registry.
```python
 >>> from decimal import Decimal
 >>> ureg = UnitRegistry(non_int_type=Decimal)
```

- [x] Closes #968,  #967, #794, #452 
- [x] Executed ``black -t py36 . && isort -rc . && flake8`` with no errors
- [x] The change is fully covered by automated unit tests
- [x] Documented in docs/ as appropriate
- [x] Added an entry to the CHANGES file


Co-authored-by: Hernan <hernan.grecco@gmail.com>
Co-authored-by: Hernan Grecco <hernan.grecco@gmail.com>

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