ProjectExplorer: Simplify BuildStepFactory

De-QObject-ify class, tr contexts are now the product's
context, which was the case in some BuildStepFactories already,
and is current state in {Run,DeployConfiguration}Factory.
One spurious object name removed.

De-virtualize canHandle(), it was never overloaded and is not
intended to be overloaded anymore.

Remove unused clone() function.

Change-Id: Iff7fba5f707505f868f94458084a18650535fa23
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/qbsprojectmanager/qbsbuildstep.cpp

@@ -832,7 +832,7 @@ bool QbsBuildStepConfigWidget::validateProperties(Utils::FancyLineEdit *edit, QS
 QbsBuildStepFactory::QbsBuildStepFactory()
 {
     registerStep<QbsBuildStep>(Constants::QBS_BUILDSTEP_ID);
-    setDisplayName(tr("Qbs Build"));
+    setDisplayName(QbsBuildStep::tr("Qbs Build"));
     setSupportedStepList(ProjectExplorer::Constants::BUILDSTEPS_BUILD);
     setSupportedConfiguration(Constants::QBS_BC_ID);
     setSupportedProjectType(Constants::PROJECT_ID);

src/plugins/qbsprojectmanager/qbsbuildstep.h

@@ -143,8 +143,6 @@ private:
 
 class QbsBuildStepFactory : public ProjectExplorer::BuildStepFactory
 {
-    Q_OBJECT
-
 public:
     QbsBuildStepFactory();
 };

src/plugins/qbsprojectmanager/qbscleanstep.cpp

@@ -295,7 +295,7 @@ QbsCleanStepFactory::QbsCleanStepFactory()
     registerStep<QbsCleanStep>(Constants::QBS_CLEANSTEP_ID);
     setSupportedStepList(ProjectExplorer::Constants::BUILDSTEPS_CLEAN);
     setSupportedConfiguration(Constants::QBS_BC_ID);
-    setDisplayName(tr("Qbs Clean"));
+    setDisplayName(QbsCleanStep::tr("Qbs Clean"));
 }
 
 } // namespace Internal

src/plugins/qbsprojectmanager/qbscleanstep.h

@@ -114,8 +114,6 @@ private:
 
 class QbsCleanStepFactory : public ProjectExplorer::BuildStepFactory
 {
-    Q_OBJECT
-
 public:
     QbsCleanStepFactory();
 };

src/plugins/qbsprojectmanager/qbsinstallstep.cpp

@@ -338,7 +338,7 @@ QbsInstallStepFactory::QbsInstallStepFactory()
     setSupportedStepList(ProjectExplorer::Constants::BUILDSTEPS_DEPLOY);
     setSupportedDeviceType(ProjectExplorer::Constants::DESKTOP_DEVICE_TYPE);
     setSupportedProjectType(Constants::PROJECT_ID);
-    setDisplayName(tr("Qbs Install"));
+    setDisplayName(QbsInstallStep::tr("Qbs Install"));
 }
 
 } // namespace Internal

src/plugins/qbsprojectmanager/qbsinstallstep.h

@@ -119,8 +119,6 @@ private:
 
 class QbsInstallStepFactory : public ProjectExplorer::BuildStepFactory
 {
-    Q_OBJECT
-
 public:
     QbsInstallStepFactory();
 };