Re-add WS4.0 logic of ClientSide as a fallback

[Jand42]

With the changes on #853, the client function in back-compatibility package WebSharper.UI.Next is broken unless the old logic for looking up a single call to a static method from a quotation is restored as a fallback if no pre-compiled form of the quotation exists.

Also, uses of ClientSide always create a new generated JavaScript function for the expression (on current master), even if it is a single call to a static method which was the only form allowed in 4.0. By excluding these from pre-compilation with a simple pattern match, the fallback would work for them as before, resulting in no extra code that is just doing redirection.

[Jand42]

There is an unnecessary error thrown when a JavaScript argument is not quotation literal. Now the fallback can handle dynamic quotations again, if they are containing a call to a single static method. Also, in UI we need to pass along a quotation value in the client alias for Doc.ClientSide.