Upgrade to Qt Creator 4.9

[iohanaan]

No description provided.

[iohanaan]

Address issue #335

[gavanderhoorn]

I'm always amazed by the nr of (breaking) changes the Qt (Creator) devs introduce in new minor versions.

It's obviously positive that they keep working on their product, but it makes the life of plugin maintainers so much harder.

[Levi-Armstrong]

@iohanaan Thank you for your contribution. I should be able to pull it down this week and test it and provide feedback if necessary.

[vincent-hui]

@Levi-Armstrong will you submit ROS plugin to the Qt Creator source on codereview.qt-project.org ? You can save time consuming effort to adapt it to API changes.
#325

[Levi-Armstrong]

@Levi-Armstrong will you submit ROS plugin to the Qt Creator source on codereview.qt-project.org ? You can save time consuming effort to adapt it to API changes.

I agree it would be nice, but the code is not to a state that would be acceptable. It does not conform the there style guide and it is not cross platform. It would require more effort than I have at the moment to get the code up to standard where I would feel comfortable submitting. This does not prevent others though from submitting it and addressing all request changes to get it merged.

[Levi-Armstrong]

merged in #342