Remove native expression language support

[arjantijms]

Faces still has its own expression language, although this has been deprecated since JSF 1.2 and at this point is likely nothing more than a distant memory for those people who once used JSF 1.1.

Faces' own expression language at the time mimicked JSP's one, with a major difference in that it allowed deferred expressions. To prevent JSP interfering with them, they had to be passed from the template as strings and components had to manually convert them into expression types.

The Faces native expression language got merged with JSP's in JSF 1.2/JSP 2.1 UEL (Universal Expression Language), which got later split out from both into Expression Language 3.0, which on its turn was renamed in Jakarta Expression Language.

It's perhaps somewhat peculiar we're still dragging the ancient native expression language along. It's now really time to let this go and completely remove it.

[tandraschko]

@arjantijms isnt it already removed in both Mojarra + MyFaces? so we could close it.

[tandraschko]

should be done in both impls, please close