[riki137]

Continues #35 (his commits are kept as they are).

Headings, paragraphs, alerts, spaces, separators and raw html no longer build their markup in the form builder. The builder only stores what the element is (kind, text, level/type/size) and the markup comes from the new NeoFormTemplate::staticHtml(), so a custom template can restyle them. {formRow} attrs apply to them too.

1. new optional last $name argument on all of them, so they can be placed with {formRow $form['x']}. Default names are _static1, _static2, ... instead of uniqid()
2. text is translated when rendered
3. $attrs arguments removed, use setHtmlAttribute() or {formRow} attrs
4. addLineBreak() removed, addSpace('sm') does the job
5. addSpace() takes sm, md, lg or any CSS length

Added tests/Control/StaticHtmlTest.php.