to be able to share the option object among evaluators, it is passed by
pointer.

only field_sep stays static and becomes a string - that's effectively
just a cache to avoid repeated construction.

Reviewed-by: Daniel Molkentin

And adapt the device selection list.

This doesn't update at all yet, so you'll need to recreate the run
configuration or restart creator.

Add missing Q_OBJECTS where tr() was used.

This removes the all hard dependencies to and from welcome screen,
except the one to the core plugin. More in detail:

- Add IWelcomePage to add a tab to the welcome screen
- Move tabs in the modules where they belong
- Enables QHelpManager to open help fullscreen and contextually
- "Getting Started" moves to Qt4ProjectManager
- Projects & Sessions (aka "Develop") moves to ProjectExplorer
- "Community" remains in the welcome plugin for simplicity

Just one qmakestep is allowed though. But I you can add as many
makesteps as you want.

Also fix a small bug with the import label.

Reviewed-by: Daniel Molkentin

Don't add -spec foo to the additional Arguments if foo is the same as
the default mkspec. This makes the common case better, while breaking if
you have QMAKESPEC set in teh environment and used -spec foo to override
it.

Not much error reporting etc yet. Application TRK needs to be
running on device.

I need that in the Qt4ProjectConfigWidget to decide whether I should
show a import label.

See commit d0340ee0,
which breaks it for Mac at least.

QMake contained a bug that -cache something where not copied to the
 # Command comment. So we can't reliable check whether it is still
 the same cache. That should be rarely a problem.

Use the mkspec of the qt version if none is specified in the additional
arguments. Also if given a relative path, try the source directory
first.

Importing the build settings now should never run the qmakestep.