[Form] Added relevant fields inherited from field

[Maks3w]

I added the most relevant fields inherited by Hidden type

Reference symfony/symfony#3182

[stof]

Well, I think this should be improved. each type inherits all options of its parent so doing this will duplicate lots of things (and be hard to maintain). currently, we don't add a section with inherited options.

And btw, how would you create this section for types that can have different parents depending of some options ?

[stof]

However, adding the parent is indeed needed

[weaverryan]

Yes, we need to add a lot more options - with the include, we should be able to minimize duplication. I have two other thoughts:

• Sometimes we should not show an option if it doesn't make sense for a field. For example, showing the read_only field for the hidden field it technically correct, but I don't think it's helpful
• In some cases, an option will be slightly different for one field type. In this case, we just won't be able to reuse the include for that field type - the option for that one field type will just need to be rewritten custom. It's not 100% ideal, but it's not so common.

So, we will need more of this! For example #998.

I've patched in this commit to the 2.0 branch at sha: a8842a3

Thanks for the contribution!