Added support for missing JS functions 'as', 'int', 'is', 'trace' and 'uint'. Having them be part of FlexJS removes the need to add them to the global namespace, preventing unnecessary pollution.

Signed-off-by: Erik de Bruin <erik@ixsoftware.nl>
Something doesn't like the use of 'int' as a member of 'Language', changed it to '_int'.

Signed-off-by: Erik de Bruin <erik@ixsoftware.nl>