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[!!!][TASK] Rename `section` to `slot` (#52)

The decision has been taken to rename the two view helpers `formz:section` and 
`formz:renderSection` to `formz:slot` and `formz:slot.render`.

This helps to reduce the confusion with Extbase `f:section` and `f:render` view 
helpers.

The argument `section` of the view helper `renderSlot` has also been renamed to 
`slot`.

See examples below:

Old:
```
Template :
----------
<formz:field name="myField" ...>
    <formz:section name="Field">
        <f:form.textField />
    </formz:section>
</formz:field>

Layout :
--------
<fieldset>
    <formz:renderSection section="Field" />
</fieldset>
```

New:
```
Template :
----------
<formz:field name="myField" ...>
    <formz:slot name="Field">
        <f:form.textField />
    </formz:slot>
</formz:field>

Layout :
--------
<fieldset>
    <formz:slot.render slot="Field" />
</fieldset>
```

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