Create crate and stubs for wctype

Create the wctype crate and stub functions with the unimplemented macro.

Add ctype functions and atoi/atol

Add ctype functions
  - isalnum
  - isalpha
  - isascii
  - isdigit
  - islower
  - isspace
  - isupper
Add stdlib functions
  - atoi
  - atol
Fix some warnings
Make a fmt run

add test for errno

Implement several more string functions and add errno

string: implement strncat, strncmp, and strncpy

Test if the redox version compiles too