Remove dash character from form names

If the "-" dash character is used in ajaxified forms, it may generate issues with ajax requests, as this character is badly encoded/decoded by the ajax re-render.

Symptom is that an ajax action will work once, but not twice, and the following error is visible in the javascript console:

Error: TypeError: this._form is null
Source File: http://localhost:8080/nuxeo/a4j/g/3_3_1.GA/org/ajax4jsf/framework.pack.js.xhtml
Line: 2792

As ids on client side are usually generated from the layout or widget id, the layout service should strip this character from layout and widget names when generating ids.

But other templates generating form names (like content view templates) should be stripping this character too => add a helper JSF function to handle these cases.