Updated core-lib

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Complete instructions and include automatic update of git submodule in makefile

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added missing dependency on core-lib

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Removing lowered core-lib function implementations.

These are not necessary in the interpreter but provided by the lib. Removing them should only give a performance penalty.

Signed-off-by: Stefan Marr <git@stefan-marr.de>