Brotab

* add "--target" argument to disable automatic mediator discovery and be
able to specify mediator's host:port address. Multiple entries are
separated with a comma, e.g. --target "localhost:2000,127.0.0.1:3000"
* add "--focused" argument to "activate" tab command. This will bring browser
into focus
* automatically register native app manifest in the Windows Registry when doing
"bt install" (Windows only)
* detect user's temporary directory (Windows-related fix)
* use "notepad" editor for "bt move" command on Windows
* add optional tab_ids filter to "bt text [tab_id]" command

* add "query" command that allows for more fine-tuned querying of tabs

* print all active tabs from all windows (8)
* autorotate mediator logs to make sure it doesn't grow too large
* make sure mediator (flask) works in single-threaded mode
* bt words, bt text, bt index now support customization of regexpes
that are used to match words, split text and replacement/join strings

Console client requests only those mediator ports that are actually available.