code style: operator spacing

codestyle adjustments: class declaration braces

Apply rector fixes to inc/Form

PSR-12 coding style

visibility fixes

First start at declaring visibilites for methods and properties. Still
missing: the parser/renderer stuff and the plugins

Fix buttons with invalid empty name attributes

The search buttons from the search form on the top of the page
as well as the search page both produce invalid HTML
due to the name attribute being emp

Fix buttons with invalid empty name attributes

The search buttons from the search form on the top of the page
as well as the search page both produce invalid HTML
due to the name attribute being empty.
As the name is required for each of the PHP functions
producing the buttons and is passed as an empty string,
this makes sure that parameters with empty strings get skipped.

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Form: added Button element #1312