Project: Do not save unconfigured projects

This avoids having .user files when pressing cancel on the Project Mode's
TargetSetupPage.

Change-Id: I09fc8e78c929d6f09a50ee57ef4f59555491c649
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
IBuildConfigurationFactory: Partial revert of 5a30007e45e

The find methods should not return a factory with a -1 priority.

Change-Id: I05dab0c48b24b30f88cf40f49c2bc0e24bff46ec
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Debugger: Add VariableSupport to some text fields

Change-Id: Iba1e7d2eeb49600a9952c369f66187384aa8cbf2
Reviewed-by: hjk <hjk121@nokiamail.com>