Hidden form field using JLayout

[dgrammatiko]

Separate logic/ output

Base work for better templating

Summary of Changes

Introduce a layout for this field

Testing Instructions

Apply patch and rename any backend input to hidden
eg

<field name="mytextvalue" type="hidden" default="Some text" label="Enter some text" description=""  />

Also consult: https://docs.joomla.org/Standard_form_field_types

[RonakParmar]

I have tested this item ✅ successfully on 271fe53

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_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/11008.}

[brianteeman]

I have tested this item ✅ successfully on 271fe53

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_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/11008.}

[brianteeman]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/11008.}

[wilsonge]

Merged with c0a5f70 - thanks!