Fixes #6113: Improved debugger configuration and request UI

- Responsive tables.
- Route is displayed by default, action is available as tooltip.
- Better config table display.
- PHP extensions are sorted alphabetically.
improved documentation about loadDefaultValues()

issue #6126
Updated GridView guide [skip ci]

close #6128
fixed apidoc wrong property definedBy

fixes #5899
added Formatter::defaultTimeZone to allow non UTC-values in DB

fixes #5683