Rsync Wrapper

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* add a stop button
* add a password field in the task if you wish to use authentication in rsync:// protocol
* a new task execution manger
* rsync and dbclient re-compiled by NDK r12 because previous compiled binaries cannot use getaddrinfo() on Android M, as Google's security update forbids that on any statically linked binaries prior to CVE-2015-7547