* add test and expected output

Add implementations of sprintf and snprintf so that we can get a bit
closer to compiling libc-test.

Merge the final components for Aarch64 support into master.

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