Implement rename

[Patryk Kubiak]

The function rename (stdio) needs to be implemented according to the POSIX standard: http://www.cplusplus.com/reference/cstdio/rename/

It should use:

extern oC_ErrorCode_t       oC_VirtualFileSystem_rename        ( const char * OldName , const char * NewName);

[Patryk Kubiak]

Removing component: stdio (automated comment)