This commit adds a page to the config dialog in which the user can choose
which metrics GC will show for intervals. The GUI design could use some work,
but the functionality is there. All implemented metrics are available to
choose, and choices are saved across restarts.
The left side of MainWindow is now a toolbox which contains
Ride Analysis and Racing and Training options. The Right side
tabs have been reorganised and associated with the toolbox.
To support the population of the Racing and Training left tool
the config dialog has been updated to enable the user to configure
the location of their workouts.
In addition, the config dialog now calls upon MainWindow to issue
a configUpdate() signal to notify widgets when config has been
updated. This is a refactoring of the existing mechanism that
only called realtimeWindow->updateConfig, now any widget can
connect to the MainWindow signal and re-read its config appropriately.
Currently, the TrainTool and RealtimeWindow widgets have been coded to
use this.
The ConfigDialog is modal, so it needs to delete itself. However, the
existing code contained a bunch of destructors with calls to delete on
widgets. That's wrong. Widgets are automatically parented on being added to
layouts, the parent widgets delete their children in their own destructors.
So remove all the explicit deletes.
