Wizards: Improve list of files displayed.

Extract the common root directory and display in separate
line. Use the routine from
the cvs plugin for that, moving it to stringutils.h.

src/libs/utils/utils.pro

@@ -5,7 +5,7 @@ QT += gui \
 DEFINES += QTCREATOR_UTILS_LIB
 include(../../qtcreatorlibrary.pri)
 SOURCES += reloadpromptutils.cpp \
-    settingsutils.cpp \
+    stringutils.cpp \
     filesearch.cpp \
     pathchooser.cpp \
     pathlisteditor.cpp \
@@ -47,7 +47,7 @@ win32 {
 else:SOURCES += consoleprocess_unix.cpp
 HEADERS += utils_global.h \
     reloadpromptutils.h \
-    settingsutils.h \
+    stringutils.h \
     filesearch.h \
     listutils.h \
     pathchooser.h \