Qbs: Make name of some qbs-based member variables more explicit

This is to avoid confusion between methods referring to Qt Creator classes
and Qbs classes of the same name.

Change-Id: I3c9d66c593fb8004a0d47b115a0023aca0d41f28
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Qbs: Rename a couple of members to make them more obviously Qbs related

This is to avoid confusion between methods referring to Qt Creator classes
and Qbs classes of the same name.

Change-Id: I25b40c6fe1d2272a9d9b0f7fab2a4cafa079df8c
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Qbs: Add pointer to the project to QbsProjectNode

Change-Id: I81fe083ee4350efd89c3afb3f70deb46d0409ee2
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Qbs: Properly report related runconfigurations for Qbs nodes

This fixes the run options in the context menu.

Change-Id: If4911f7357329fcb843206165e20d53bf6717258
Reviewed-by: Daniel Teske <daniel.teske@digia.com>