ProjectExplorer: Replace ProjectConfiguration::m_macroExpander

... by MacroExpanders in Build and RunConfiguration. Deploy didn't
use its own, BuildStep always composed an empty expander with
the BuildConfiguration's, uses now the BuildConfiguration's expander
directly.

Change-Id: I9de51bfc32aeb3d73f4974175e42a37807e49ac1
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/projectexplorer/buildconfiguration.h

@@ -32,6 +32,8 @@
 #include <utils/environment.h>
 #include <utils/fileutils.h>
 
+namespace Utils { class MacroExpander; }
+
 namespace ProjectExplorer {
 
 namespace Internal { class BuildConfigurationPrivate; }
@@ -118,6 +120,8 @@ public:
 
     void doInitialize(const BuildInfo &info);
 
+    Utils::MacroExpander *macroExpander() const;
+
 signals:
     void environmentChanged();
     void buildDirectoryChanged();