Add configurable toast

[matewiszt]

Add toast-content component to make the content more configurable and suitable for accepting HTML markup, not only text.

[AStaroverov]

Thank you for pull request! I check this soon.

[matewiszt]

Thank you in advance for your feedback!

[AStaroverov]

It was tested? This part looks like incorrect. And i dont understand than ToastContent better v-html. If u want use custom toasts it incorrect implementation.

[matewiszt]

Yes, I use it in a project like that. It is not about better understanding but if you use v-html, the message will be inserted into a span tag but if you want to insert a markup and not only a plain text, another component is more useful. Of course, if you don't think it is useful, just leave it as it is. It is just a possibility ;)

[matewiszt]

But regarding the correctness: you were right that I accidentally ommitted the templating curly brackets from the message props, now it is fixed.