Create a dynamic block to replace the [bw_contact_form] shortcode

[bobbingwide]

The [bw_contact_form] shortcode displays a simple HTML form.
We would like to be able to use the existing logic in a dynamic block.

Requirement

• Develop a new block called Contact form
• Support the attributes that may be passed to the existing [bw_contact_form] shortcode

Proposed solution

• Implement as a Dynamic block.

[bobbingwide]

To test #8 we'll change the registration of the Contact form block so that Gutenberg enqueues the styles.
We'll then have to investigate how to change the build to produce multiple scripts and see how that affects the overall behaviour of the site.

[bobbingwide]

Changing the edit: method to return using parentheses rather than square brackets seems to resolve the annoying react message about duplicate keys. It'd be nice to know why... but I'll check in this version anyway.

[bobbingwide]

The Contact form already works with Gutenberg v4.0.0 but the following changes could be made anyway.

• Add docblock comments - See Block inserter - The editor has encountered an unexpected error - Chrome problem #28
• Set it to use once per post

[bobbingwide]

The Contact form block is now delivered in oik. See bobbingwide/oik#138