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Fix multiline import statements (proposal for issue #8) (#63)

* Add skeleton for fixing multiline from imports

* Rename "Contination" to "PendingFix"

* Add fix for the multiline from import problem

* Add fix for multiline imports without from

* Add fix for multiline relative imports

* Fix other edge cases of multiline import

Such as:
- leading/trailing commas/line continuation
- try/except
- semicolon
- empty imports as result

In some cases the approach of "not changing anything if it is too risk"
was adopted (as already happens in other parts of the code).

* Deal with CLI options in FilterMultilineImport

* Simplify multiline imports by ignoring comments

Unfortunately treating inline comments inside imports increases the
complexity in the implementation.
This change reduces complexity by refusing to change multiline import
statements that contain comments.

This approach is also used in other parts of the code.

* Simplify logic in multiline imports

... By using the existing code as a template.

* Fix docstrings according to pydocstyle

* Remove unused itertools

* Remove solved TODO comment

* Add examples from issue #8 and fix edge cases

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