Allow specific form ids for clientside validation

Rerolled the patch of #24 so it applies on the 4.0.x version.

Sorry, Previous patch didn't contain everything.

Applied the patch to 4.x and it appears to be working as advertised.

One suggestion, I think it would be better if instead of a checkbox to enable on all forms it was radio buttons
[] Add to all forms except those listed
[] Add to only the forms listed

In my case there are only a few forms I want to disable it on, so listing every possible form I want it on for would be difficult, plus I don't want to have to update the list when new forms are added to the site.

Copying NW tasks from #21 to ID.

I rerolled this to move the menu link from config->system to config->user interface. Also had to move the setting.yml file into the config/install directory to prevent an error when installing the module.

This works well for our needs.

Patch #31 seems to work on our side (Using version 4.1.0).

I also agree with suggestion in #28, to have both options (white/black-list).