iPerf2 for Android

The goals include maintaining an active iperf 2 code base (code originated from iperf 2.0.5), preserving interoperability with iperf 2.0.5 clients and servers, preserving the output for scripts (new enhanced output requires -e), adopt known 2.0.x bug fixes, maintain broad platform support, as well as add some essential feature enhancements mostly driven by WiFi testing needs. Also added python code to centralize test control.

For more info : https://sourceforge.net/projects/iperf2/

Recent changes:
Support Android-15.
Clear Button : Clears the output text.
Help: Use Iperf's help instead of window based switcher.
Input commands with drop-down history pop-up.
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Minor Fixes : Save/Start button click issue for empty strings.