ProjectConfiguration: Add isActive() method

Returns true if the ProjectConfiguration element is currently active
and false otherwise.

Just a convenience method.

Change-Id: If75809ae7e78149d264deaaf6adc4ca8a8be43c2
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/projectexplorer/runconfiguration.cpp

@@ -215,6 +215,11 @@ RunConfiguration::~RunConfiguration()
     qDeleteAll(m_aspects);
 }
 
+bool RunConfiguration::isActive() const
+{
+    return target()->isActive() && target()->activeRunConfiguration() == this;
+}
+
 QString RunConfiguration::disabledReason() const
 {
     if (target()->project()->isParsing())