Issue 21525: Accept lists in Tkinter

There is very common error when user pass list instead tuple to Tkinter. Some functions accept both tuple and list, some functions reject list, but many functions silently convert non-tuple value to str (e.g. [1, 2] -> '[1, 2]' instead of expected Tcl representation '{1 2}'). The proposed patch adds support of Python lists in all Tkinter functions which accept tuples.