[FEATURE] Introducing Form Option ViewHelpers

Introducing a new way of setting Form options via ViewHelper.

Included:
- generic `<flux:form.option name="foo" value="bar" />`
- icon  `<flux:form.option.icon value="path/to/iconFile" />`
- group  `<flux:form.option.group value="groupName" />`

In case of more than one element of the same special type (icon/group) or of the same name attribute in a single `<flux:form/>` the last one wins.

This viewHelpers may replace the current way of setting form options via attribute.