iostool: support for qml debug and remote port forwarding

Change-Id: Id45cc17df1cb941ad0e09ecb6d7936dacac24755
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>
ios: qml debug support

Change-Id: I0fdd7a35de7b446cd991407d7c30b92cd3cc7787
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>
ios: immediately skip running when the executable is missing

Change-Id: I9a867f2a62811e84fa758e9d27272b6583067afb
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>