Slight improvements to readability.
Dropped suggestions for string_view (settings.h:101), pass by value
(settings.h:82), reverting double to a float (config.cpp:316), and other
smaller ones, some out of scope.
Addresses review feedback.
Co-authored-by: Ameer J <52414509+ameerj@users.noreply.github.com>
Creates a new BasicSettings class in common/settings, and forces setting
a default and label for each setting that uses it in common/settings.
Moves defaults and labels from both frontends into common settings.
Creates a helper function in each frontend to facillitate reading the
settings now with the new default and label properties.
Settings::Setting is also now a subclass of Settings::BasicSetting. Also
adds documentation for both Setting and BasicSetting.
ameerj