GenericProjectManager: Allow users to remove directories from a project

... via the project context menu.

Fixes: QTCREATORBUG-16575
Change-Id: I02650a8ef70ffe22c6a42a5450588be4506af925
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/genericprojectmanager/genericproject.h

@@ -26,6 +26,7 @@
 #pragma once
 
 #include <projectexplorer/project.h>
+#include <utils/fileutils.h>
 
 namespace CppTools { class CppProjectUpdater; }
 namespace Utils { class FileSystemWatcher; }
@@ -46,6 +47,8 @@ public:
     bool setFiles(const QStringList &filePaths);
     bool renameFile(const QString &filePath, const QString &newFilePath);
 
+    Utils::FilePath filesFilePath() const { return Utils::FilePath::fromString(m_filesFileName); }
+
     enum RefreshOptions {
         Files         = 0x01,
         Configuration = 0x02,