Form partial submit

talking with @BalusC we came to the same conclusion that inside faces.js
the method faces.getViewState should include the partial submit logic and, to do that,
the best solution is to change the firm of the method like this:

`faces.getViewState = function(form,execute)`

https://github.com/omnifaces/omnifaces/issues/699

I'm working on it and, as suggested by @BalusC, inside Mojarra it should be an experimental feature

Where and how I should add and read a global variable to enable/disable partial submit?

Start with faces.js and the faces.getViewState entry point, then review the linked OmniFaces issue and Mojarra's experimental-feature context. Determine where the global setting for enabling or disabling partial submit belongs and how it should be read; done means the proposed method signature and feature toggle behavior are defined and implemented.

Written by the indexing model from the issue text.