PHPCSStandards / PHPCSUtils / 233

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Pull #65

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:sparkles: New Fixers\SpacesFixer class

This new class offers one versatile utility function `checkAndFix()` to - as the name implies - check and fix the spacing between two tokens.

It takes all the heavy lifting out of space fixes and should allow standards to get rid of a lot of duplicate code related to space fixing.

Notes:
- This method will not auto-fix if there is anything but whitespace between the two tokens. In that case, it will throw a non-fixable error/warning.
- If 'newline' is expected and _no_ new line is encountered, a new line will be added, but no assumptions will be made about the intended indentation of the code.
    This should be handled by a (separate) indentation sniff.
- If 'newline' is expected and multiple new lines are encountered, this will be accepted as valid.
    No assumptions are made about whether additional blank lines are allowed or not.
    If _exactly_ one line is desired, combine this Fixer with the (upcoming) `NewlinesFixer`.
- This method can optionally record a metric for this check which will be displayed when the end-user requests the `info` report.

Includes extensive unit tests.

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