Log file access

[MarcusWolschon]

According to https://github.com/splondike/polipoid/blob/v1.1.0/src/main/java/com/polipoid/backend/proxy/ProxyManager.xtend#L108

it does configure a log file.

A button that starts an

    Intent i = new Intent();
    i.setAction(android.content.Intent.ACTION_VIEW);
    i.setDataAndType(Uri.fromFile(videoFile2Play), "text/plain");
    startActivity(i);

to allow the user to view that log in whatever app is installed and chosen by the user to display plaintext files would be nice

[splondike]

Added this feature in the above commits, closing ticket.