Add action with global shortcut to speak text selection and another
to speak clipboard contents.
Add another action to stop speaking.
Add another action to pause/resume speaking.
Add a setting to klipper for the QTextToSpeech engine to use, if it
changes reload the QTTS object with the chosen engine.
Add a ui element to allow selecting the tts engine.

TODO: Make a kcm to allow configuration of speech-dispatcher with a gui
and add a button next to the klipper engine config if speechd is
selected to launch kcm for further configuration.
Possibly disable keyboard shortcuts by default so users don't
accidentally trigger speech features.