Allow hiding the checkbox label

And here is a patch for it. It exposes a setting per column and then enforces the #after_title attribute for each of the cells based on the column configuration.

Updating the patch to use a different attribute as there is actually a standalone setting for column titles.

Rerolled

I would like to hide the form labels for checkboxes (I don't think it is useful for radios).

In some cases, especially with the matrix component the options you expose are self-explanatory, e.g. the following table: https://www.evernote.com/l/AIjJjPlIMsRCNY6n_Kb0bRwB2kbNphGPWqo does not need the "yes" label next to each of the checkboxes, it just makes the table crowded. I would like to have an option to remove it.

The patch does this by exposing a form on the component configuration for each of the rows (perhaps it would be nicer if we were using #states, to only show when the radio option is used, but we can talk about it once the core functionality is accepted and works fine).

After patching there is an option to hide the label: https://www.evernote.com/l/AIiz2bNt6rVIJIXZA8puhqtuoOa_nZHCoIs
Which then renders like this: https://www.evernote.com/l/AIjDryuDSY5CaaG5uVmS5qVag1Vtk5BcdZM

Also the patch is rerolled, it was not respecting defaults correctly and used the column #title_display attribute incorrectly (not to mention the two whitespace errors).