[Pidgin] #16992: Port libpurple Python scripts to pydbus and Python 2+3

[Pidgin]

#16992: Port libpurple Python scripts to pydbus and Python 2+3
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 Reporter:  lew21    |      Owner:
     Type:  patch    |     Status:  new
Milestone:           |  Component:  libpurple
  Version:  2.10.12  |   Keywords:
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 All the scripts are currently using the "dbus-python" package. dbus-python
 is essentialy dead, has a incorrect API ("For compatibility reasons, its
 API involves a lot of type-guessing (despite "explicit is better than
 implicit" and "resist the temptation to guess").") and is based on
 unmantained libdbus-glib library.

 pydbus is a modern, pythonic D-Bus library built on top of PyGI and GDBus:
 https://github.com/LEW21/pydbus

 Also, most of the scripts aren't currently supporting Python 3. This patch
 makes them support both Python versions at the same time.

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Ticket URL: <https://developer.pidgin.im/ticket/16992>
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