ProjectExplore: Introduce dis/enabling of buildconfigurations

The build actions are disabled if the buildconfiguration is disabled.
The deploy and run actions are disabled if deploying or running invokes
building automatically.

Qt4BuildConfigurations are disabled while parsing.

Task-Nr: QTCREATORBUG-2576

src/plugins/qt4projectmanager/qt4buildconfiguration.cpp

@@ -70,6 +70,7 @@ enum { debug = 0 };
 Qt4BuildConfiguration::Qt4BuildConfiguration(Qt4BaseTarget *target) :
     BuildConfiguration(target, QLatin1String(QT4_BC_ID)),
     m_shadowBuild(true),
+    m_isEnabled(false),
     m_qtVersionId(-1),
     m_toolChainType(-1), // toolChainType() makes sure to return the default toolchainType
     m_qmakeBuildConfiguration(0),
@@ -81,6 +82,7 @@ Qt4BuildConfiguration::Qt4BuildConfiguration(Qt4BaseTarget *target) :
 Qt4BuildConfiguration::Qt4BuildConfiguration(Qt4BaseTarget *target, const QString &id) :
     BuildConfiguration(target, id),
     m_shadowBuild(true),
+    m_isEnabled(false),
     m_qtVersionId(-1),
     m_toolChainType(-1), // toolChainType() makes sure to return the default toolchainType
     m_qmakeBuildConfiguration(0),
@@ -92,6 +94,7 @@ Qt4BuildConfiguration::Qt4BuildConfiguration(Qt4BaseTarget *target, const QStrin
 Qt4BuildConfiguration::Qt4BuildConfiguration(Qt4BaseTarget *target, Qt4BuildConfiguration *source) :
     BuildConfiguration(target, source),
     m_shadowBuild(source->m_shadowBuild),
+    m_isEnabled(false),
     m_buildDirectory(source->m_buildDirectory),
     m_qtVersionId(source->m_qtVersionId),
     m_toolChainType(source->m_toolChainType),
@@ -652,6 +655,19 @@ ProjectExplorer::IOutputParser *Qt4BuildConfiguration::createOutputParser() cons
     return 0;
 }
 
+bool Qt4BuildConfiguration::isEnabled() const
+{
+    return m_isEnabled;
+}
+
+void Qt4BuildConfiguration::setEnabled(bool enabled)
+{
+    if (m_isEnabled == enabled)
+        return;
+    m_isEnabled = enabled;
+    emit enabledChanged();
+}
+
 /*!
   \class Qt4BuildConfigurationFactory
 */