Form validation

[ashbaldry]

Adding the ability to validate input fields in a form.

Resolves #386

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[ashbaldry]

Hi @esraay,
I've seen a couple of updates to my PRs, thanks for that! I have made more updates to this one (including a small vignette) in a separate package {fomantic.plus}. If you would prefer, instead of having the two separate versions, I can add these updates to this branch and just keep {shiny.semantic} maintained.

[scizmeli]

Hi @ashbaldry thanks for your input. As a new team we started to give shiny.semantic regular maintenance. It would be a good idea to submit your vignette for Appsilon's reviewal and keep as much as possible in one place.