Feature: #79402 - New Fluid ViewHelper f:variable added

See forge#79402


A new ViewHelper f:variable has been added in Fluid 2.2.0 which is now minimum required dependency for TYPO3. The ViewHelper allows variables to be assigned in the template:

<f:variable name="myvariable">My variable's content</f:variable>
<f:variable name="myvariable" value="My variable's content"/>
{f:variable(name: 'myvariable', value: 'My variable\'s content')}
{myoriginalvariable -> f:variable.set(name: 'mynewvariable')}


The new ViewHelper is now available in any and all Fluid templates being rendered in TYPO3.