Add GetPassword activity

[Bill Xiao]

Hi Allan,
I came across a need to store password in encrypted form. So I created a new activity, GetPassword. Its usage is simple. Just type in plain password in Text field and the activity will automatically encrypt it and by using Decrypted OutArgument, you can fetch back password in plain text.
The only issue is Text field cannot be updated with encrypted text. Only after close the workflow and reopen it, then the encrypted text will appear in the Text field. This is not perfect. Any suggestion on how to refresh it immediately?

[Bill Xiao]

The pull request is: https://github.com/open-rpa/openrpa/pull/487

[Allan Zimmermann]

Saw it, thank you. I added a few comments. Feel free to answer here or in the pull request

[Bill Xiao]

@allan-zimmermann Fair enough. I closed my pull request.