Added a central list of enabled breaks, instead of keeping track of state in each break's own settings.
Tweaked break settings dialog to use a combo box to choose the configuration, instead of an on/off switch beside each break. (Fixes multiple ways to disable all breaks).
Added a message in the main window if the break helper application is not running when it should be. (This currently appears more often than it should because the settings application is not autostarting the helper application).