C standard library base

'The very basic C Standard library' developement has begun!

So far, the basis of the stddef, stdbool, stdint, math and string headers
is done. The string.h (and string.c) will be made quite standard-compliant,
others will be made on-demand. After the string is printf's turn.
Merge branch 'master' of https://github.com/Razbit/razos