`adbe input-text` should support unicode characters

[ashishb]

Currently, it does not support Unicode characters and fails. See https://stackoverflow.com/questions/14224549/adb-shell-input-unicode-character for how to go abut it.

[ashishb]

This might be blocked by https://github.com/docopt/docopt/pull/220

[sweep-ai[bot]]

@ashishb I have started working on this PR to support unicode characters in adbe input-text. My plan is:

1. Decode the input text to UTF-8 in the input_text() method of adb_enhanced.py
2. Send the UTF-8 encoded bytes to adb using adb_helper.execute_adb_shell_command()

This should allow adbe input-text to support unicode characters. Give me a minute!

---

I'm a bot that handles simple bugs and feature requests but I might make mistakes. Please be kind!