Weekly phpMyAdmin contributions 2017-W48

Last week I merged the Display templates to reduce the number of includes and also to make it easier to read the code. I also changed all calls to Twig classes from PSR-0 to PSR-4.

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Weekly phpMyAdmin contributions 2017-W45

Last week I refactored several methods that contained HTML code to use the template system, replaced global variables with dependency injection in some classes and fixed a few minor bugs.

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