Utils: add FilePath::baseName

Removing some FilePath::toFileInfo() calls

Change-Id: I49be2ef260f225e07b64ee8ace6a8cd47a9d8bb2
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/fileutils.h

@@ -103,6 +103,7 @@ public:
 
     QString fileName() const;
     QString fileNameWithPathComponents(int pathComponents) const;
+    QString baseName() const;
 
     QString scheme() const { return m_scheme; }
     void setScheme(const QString &scheme);