added pause to file hashing

libretroshare/src/file_sharing/hash_cache.h

@@ -84,6 +84,8 @@ public:
     uint32_t rememberHashFilesDuration() const { return mMaxStorageDurationDays ; }
     void clear() { mFiles.clear(); mChanged=true; }												// drop all known hashes. Not something to do, except if you want to rehash the entire database
     bool empty() const { return mFiles.empty() ; }
+	void togglePauseHashingProcess() ;
+	bool hashingProcessPaused();
 
     // Functions called by the thread
 
@@ -112,6 +114,7 @@ private:
     std::map<std::string, HashStorageInfo> mFiles ;	// stored as (full_path, hash_info)
     std::string mFilePath ;							// file where the hash database is stored
     bool mChanged ;
+	bool mHashingProcessPaused ;
 
     struct FileHashJob
     {