Start using the new exceptions

[jrfnl]

Start using the new exceptions throughout PHPCSUtils

This implements the use of the new exceptions introduced in #598 in all the right places in PHPCSUtils.

Notes:

• The BCFile class is explicitly exempt from this change as the methods in that class emulate the PHPCS native methods, which means they should also throw the PHPCS native exception.
• Includes switching a number of test classes from the UtilityMethodTestCase parent class to the PolyfilledTestCase parent class - which is basically the UtilityMethodTestCase + the PHPUnit Polyfills -. This allows for expecting the exceptions without having to jump through hoops for PHPUnit cross-version support.
• Includes adding select extra tests where needed.

Only catch what should be caught

This changes the exceptions being caught in various catch statements to more specific ones.

This means that errors which should always have been thrown, will now throw and only the potentially expected (and acceptable) exceptions will now be caught.

Note:

• For the Namespaces::getDeclaredName() method, the catch has not been changed (other than switching from the PHPCS native RuntimeException to the PHPCSUtils one).
  The reason for this is that the method is explicitly documented as returning false for non-existent tokens.
  While this behaviour is not in line with other methods in PHPCSUtils, changing the behaviour could be seen as a breaking change, so should be done in a major release.

Includes test for where the behaviour of the functions is now different.

[jrfnl]

Rebased without changes, other than squashing the "catch change/test" commit into the commit making the catch changes.
Marking as ready as #598 has been merged now. Merging once the build passes.