Small style fixes

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added missing primitive Object>>#halt

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Updated to latest core-lib

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Fixed incomplete initialization for classes of nil, true, and false

The classes were not put into the globals dictionary and got loaded more than once, which lead to the classes being not equal to each other.

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