Add Edit In Place functionnality

[damienalexandre]

This PR adds Edit In Place to any page on a Symfony project. This is highly experimental ⚠️ but.. it's awesome 😋

The JavaScript part is based on the excellent ContentTools lib, v1.3.1 by Anthony Blackshaw, very well written and using a real ContentEditable attribute, which is very elegant.

Demo

TODO

There is still a lot of stuffs to do:

• Add better handling of the multiple configs available in the Bundle, for now, I force the first one only
• the Twig Extension part is messy, should find a better way than full override of the bridge
• in ResponseListener, remove the hardcoded configName / domain / locale parameters
• remove all cache headers from response if when the editor kick in
• [ ] all the links when editing should have the token added for easy navigation. Also maybe an URL token is NOT the best way to handle enabling / disabling the editor
• validate the incoming messages (create a custom EditInPlaceMessage model?)
• for html keys, set back the default WYSIWYG tools (like if we detect .html in the key name, pop the HTML editor?)
• if the ajax requests fail display the error (validation?)
• add tests!!
• make sure it works with transChoice too
• [ ] maybe support PHP templating too?

Cheers

[Nyholm]

Cool. I think it looks good. Let's just do some more of those things listed as TODO on this PR and I'll be happy to merge.

[Nyholm]

We should add a TODO here so we do not forget.

[damienalexandre]

@Nyholm Ready for review!

I will also create issues for some issues and todo I left there,
like the ability to display contextual information when the editor kicks in (available parameters, etc).

And I'm sending the documentation PR today 😉

[Nyholm]

Thank you. It looks great.

While reading the changes Im starting to consider moving some classes to a library... But Im not sure. We can talk about that later. I'll merge this for now. Really good job!