add : Strings.ToString

[BeckerStS]

Currently only Strings to any Integers are supported within this library ... which is btw. also covered by the @ax/system-strings library.
Adding additional string conversions like : (W)STRING<>(W)STRING would be nice, since there is no such comfort function as of now.

add cunctions (if feasable):

Strings.ToString (str : STRING, value => WSTRING) : BOOL;
Strings.ToString (str : WSTRING, value => STRING) : BOOL;