Use Nico's suggestion to just leverage the width of the field, and leave
a comment.

to save on recalculation of the size and having to subtract the margins
to do the tally, then re-apply.

 - Switch to {} widget initialization
 - set fixed size on the Toggles so they don't scale down vertically
 - add another setting section for INTERFACE
 - add a placeholder value for deviceFingerprintValue_ so it can calculate the right size.
 - fix warnings about `QLayout: Attempting to add QLayout "" to UserSettingsPage "",` in boxWrap
 - hide widgets properly in Q_OS_MAC
 - remove mainLayout_ completely
 - clean up resizeEvent

This allows form fields to wrap dynamically when they are too long for
the view. This should help mobile and small screen users to configure
the app without having to force it into portrait mode, or not be able to
reach the settings fields at all.

On first launch, before the user has configured any settings,
check the value of the QT_QPA_PLATFORMTHEME environment var.
If it is set, use the system theme as the default instead of the
light theme.  This fixes #72.

Author color is now cached so that it will not be re-calculated
each time a new message is posted.  This cache gets cleared when
the theme is changed.

Additionally, the author color is now automatically refreshed
when the theme is changed, fixing the issue where you had to
change rooms before the colors would switch.

Theme and Font Family settings will now correctly display the stored
settings when nheko is re-launched.  Previously, these combo boxes
would default to the first thing in the combo box, even if that
wasn't what the user selected.

User can now select a font from the installed fonts on their system

This font currently will only be applied when nheko is restarted
(similar to how font size and scaling currently work).  This will
be addressed in a future commit.  Additionally, the dropdown
does not correctly select the previously-chosen user font, and
instead defaults to the first font available on the system
(alphabetically).  This is similar to the issue with the 'Theme'
combo defaulting to 'Light' even when another theme is selected.

fixes #161

fixes #388

fixes #357
fixes #335
fixes #230

fixes #261

fixes #131

fixes #2