_Tcl::get_var

Utility multi-method to return the value of the variable specified.

If a single string param is passed, then we lookup a scalar.

If two params are passed, then we lookup a TclArray (first param) the value for a specific key (second param)

Use the call level to determine if we are referring to a global variable or a lexical variable - will no doubt require further refinement later as we support namespaces other than the default, and multiple interpreters.