Core: Clean up context

Move the context code into its own implementation file (from id.cpp)

Change-Id: I5e487e0ab0a9b3a33ef32f2d5b7a5d703bded099
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

src/plugins/coreplugin/id.cpp

@@ -32,11 +32,12 @@
 
 #include "id.h"
 #include "coreconstants.h"
-#include "icontext.h"
 
 #include <utils/qtcassert.h>
 
+#include <QByteArray>
 #include <QHash>
+#include <QVector>
 
 namespace Core {
 
@@ -131,19 +132,4 @@ QString Id::toString() const
     return QString::fromLatin1(stringFromId[m_id]);
 }
 
-Context::Context(const char *id, int offset)
-{
-    d.append(Id(QLatin1String(id) + QString::number(offset)).uniqueIdentifier());
-}
-
-void Context::add(const char *id)
-{
-    d.append(Id(id).uniqueIdentifier());
-}
-
-bool Context::contains(const char *id) const
-{
-    return d.contains(Id(id).uniqueIdentifier());
-}
-
 } // namespace Core