Added ParameterAction class for QActions acting on files.

Reduce inconsistencies in tr()-Strings provided for
QActions that act on a current <something> (mostly files) by
introducing a ParameterAction class that takes the tr()-Strings
at construction time and provides a setParameter(QString) slot,
allows for setting that parameter or an empty string, which
will cause the displayed text to be updated.

src/libs/utils/parameteraction.cpp

@@ -0,0 +1,61 @@
+#include "parameteraction.h"
+
+namespace Core {
+namespace Utils {
+
+ParameterAction::ParameterAction(const QString &emptyText,
+                                     const QString &parameterText,
+                                     EnablingMode mode,
+                                     QObject* parent) :
+    QAction(emptyText, parent),
+    m_emptyText(emptyText),
+    m_parameterText(parameterText),
+    m_enablingMode(mode)
+{
+}
+
+QString ParameterAction::emptyText() const
+{
+    return m_emptyText;
+}
+
+void ParameterAction::setEmptyText(const QString &t)
+{
+    m_emptyText = t;
+}
+
+QString ParameterAction::parameterText() const
+{
+    return m_parameterText;
+}
+
+void ParameterAction::setParameterText(const QString &t)
+{
+    m_parameterText = t;
+}
+
+ParameterAction::EnablingMode ParameterAction::enablingMode() const
+{
+    return m_enablingMode;
+}
+
+void ParameterAction::setEnablingMode(EnablingMode m)
+{
+    m_enablingMode = m;
+}
+
+void ParameterAction::setParameter(const QString &p)
+{
+    const bool enabled = !p.isEmpty();
+    if (enabled) {
+        setText(m_parameterText.arg(p));
+    } else {
+        setText(m_emptyText);
+    }
+    if (m_enablingMode == EnabledWithParameter)
+        setEnabled(enabled);
+}
+
+}
+}
+