TernaryExpressionNode is now PreevaluatedExpression

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

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Make #at:put: an eager primitive

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