Add toggle to control the display of the field's label

[bobbingwide]

There are times when the field's label doesn't need to be displayed.
For example Google map, which is pretty obvious.
And Event when, or Event calendar - which are also virtual fields - where the label should be different or not required.

Requirements

• ISBAT indicate if the label and separator are required before the field's value.
• When not required the label and separator should not be displayed.
• The front end should display the results correctly
• The block editor should do its best.

Proposed solution

• Add a toggle to control the display of the label and separator - attribute: showLabel, default: true
• Optionally allow the separator to be defined
• Change the server side rendering to cater for the toggled field
• Change the block's display to cater for the toggled field

[bobbingwide]

The first QAD solution was no good since it disabled the label for the field permanently.
So when the field was displayed in a later section, eg. by [bw_fields] in a widget area, then the label was disabled there as well.

The problem also occurs for the same field being displayed twice in the post.

[bobbingwide]