Move most primitives to files other than Builtins.st

We actually need only a handful of primitives to be in
Builtins.st; all 
of them can reside in their own class files.  One of them
also was unused.

Just to improve a little the usability, I've pushed
SysDict.st to be 
loaded near the beginning because it does include a few
primitives that 
are useful to debug the VM.

The patch I attach only includes the lib.c patch and the new
Builtins.st 
file; I'll push the full patch to the arch repository in a
few hours (it 
is several tenths kb long but it's just shuffling code
around).

This will ease conversion of Builtins.st to the new syntax,
since it is 
the only manual conversion to be done (most others will be
done 
automatically).

Paolo

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