[NEW_FEATURE] Snapshot feature.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1224 f5eea248-9336-0410-98b8-ebc06183d4e3
[NEW_FEATURE] Automatic Backup System (in progress).

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1225 f5eea248-9336-0410-98b8-ebc06183d4e3
[NEW_FEATURE] Automatic Backup System (in progress).

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1226 f5eea248-9336-0410-98b8-ebc06183d4e3