Ability to launch gespeaker from command-line with given input file / stdout

[muflone]

It would be nice, if gespeaker can be launched from command-line with file (or text from stdout) that should be spoken.

[muflone]

Actually, this can be achieved pretty easily, with 2 minor changes:

• pass all arguments to gespeaker.py at start, and
• in 'welcome' plugin, before setting default greeting, check for input using 'fileinput', and set it, if present.

[muflone]

This could be achieved via dbus interface.
But it needs more tests before closing this issue