Feat: Get Stack to fully implement ITypedItem where possible

[iJungleboy]

I'm submitting a

[x] feature request

...about

[x] Razor templating

Current Behavior / Expected Behavior

...to enable more flexible use of the stack.

As of now it only supports ITyped, but this is a bit limiting for more advanced strong-typed scenarios.

Your environment

• 2sxc version(s): 17.06.03