Most of standard library; update binaries

This commit contains:
- most of the standard library (still TBD: <time.h>, *scanf(), tmp*())
- pre-compiled library for DOS (tiny/small and huge mode(l)s)
- pre-compiled binaries for DOS (driver, compiler, linker)
- updated binaries for Windows and Linux
- a "Hello World" test app compilable for DOS

Beware, there probably are a number of bugs in the library.