refactor: rename parameters to be less ambiguous

refactor: use existing and simpler method

refactor: Rename method to better convey its purpose

fix: remove multi-select handling -> make PR later

We currently throw an exception with setting the multiple-attribute is
attempted. If we want to implement this functionality, it might be more
sens

fix: remove multi-select handling -> make PR later

We currently throw an exception with setting the multiple-attribute is
attempted. If we want to implement this functionality, it might be more
sensible to make an extra commit for that.

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fix: Make this Form method chainable as it should be

fix: ensure that there is only 1 selected option

Multiple selected option would not be valid HTML.

Add support for optgroup-tags for select-fields

In more complex selects we may want to group options by some criteria.
HTML has the <optgroup>-tag for that purpose.

However in Order to not duplicat

Add support for optgroup-tags for select-fields

In more complex selects we may want to group options by some criteria.
HTML has the <optgroup>-tag for that purpose.

However in Order to not duplicate code, I've to move the handling of
options to the OptGroup-Class completely.

Known Issues:
-------------
* We may have more than one option with the same value and therefore
more than one option may be marked as selected.

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Remove type-attr from <select> b/c it's invalid

fixes #1776

PHPDoc Form

PHPDocs Form

Fix resetting select-options attributes

Escape option-attributes and fix typo

Make select-options in Form more configurable

Now classes and data- attributes can be added to individual options

Remove unnecessary linebreaks from new Form

Since Firebug it is no longer necessary to structure html with linebreaks. See also Issue #924

correctly handle line breaks in textarea #1312

Textareas use CRLF, but internally we use LF.

form prefill: honor empty values

when a form was submitted with an empty input, that data should still
overwrite the preset value.

added dropdown type to new Form system #1312

TagCloseElements conform to inherited expectations

Throwing an exception on request for an id or attribute breaks several
functions like $form->findPositionByAttribute.

See issue #1312

Form: fixed class checks

Form: more flexible label handling #1312

You now can add labels that don't wrap around inputs, but you have to
ensure IDs are properly assigned yourself.

The Label class has been renamed to LabelEl

Form: more flexible label handling #1312

You now can add labels that don't wrap around inputs, but you have to
ensure IDs are properly assigned yourself.

The Label class has been renamed to LabelElement to reflect the naming
scheme of the other elements.

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Form: added Button element #1312

Form: correctly set type attribute for inputs #1312

improve PHPDocs

typo

added element query functions