make job/executor signal/slot connections queued

This prevents call stacks like
    onProcessError
    ...
    scheduleJobs
    ...
    onProcessSuccess
which destroys the executor's state handling.

Change-Id: I2a98a368e3ed75f4d617389938c88809e68623f3
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
make VS 2013 known to detect-toolchains

Change-Id: Ib4f171a39679a296725af9111e04c2a026271230
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
remove strange default values for MSVC paths

Change-Id: Ibf4e56af8898f553eed229452ca13e5c35b9be37
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>