strparse: switch to curl_off_t as base data type

- add hex and octal parsers to the Curl_str_* family
- make curlx_strtoofft use these parsers
- remove all use of strtol() and strtoul() in library code
- generally use Curl_str_* more than strtoofft, for stricter parsing
- supports 64-bit universally, instead of 'long' which differs in size
  between platforms

Extended the unit test 1664 to verify hex and octal parsing.

Closes #16336

lib/vssh/wolfssh.c

@@ -34,7 +34,6 @@
 #include "sendf.h"
 #include "progress.h"
 #include "curl_path.h"
-#include "strtoofft.h"
 #include "transfer.h"
 #include "speedcheck.h"
 #include "select.h"