Fix infinoted shutdown procedure on Windows
Fix infinoted shutdown procedure on Windows

It is run concurrently with the program, so instead of just shutting infinoted
down (which did not seem to be a problem when InfStandaloneIo could not handle
calls from another thread), now we dispatch a message to the main thread, to
shut infinoted down.

tyll/libinfinity,gobby/libinfinity,tyll/libinfinity,tyll/libinfinity,gobby/libinfinity,gobby/libinfinity