fix nasty bug in GenProcess callAsync

We previously attempted to force the content within the async result
into 'die/exit' which crashed on attempting to serialise some data
structures.
don't try to use the TypeRep in 'die' as this can fail horribly
fix state propagation bug in GenProcess main loop

Forgetting to recalculate the match specification in each recursive call
led to stale state being returned from executing callbacks.
quieten the compiler
As per ef0b63 - apparently we cannot work with *any* TypeRep here
quiet warnings, quiet
re-organise Platform exports
Fiddle with the Counter server and tests until we have something working

However, there is clearly a nasty bug in GenProcess 'call', so we have
some disabled test cases for the time being.