Labels before candidates is now customizable.

The labels in the candidate window can now have
customized font, font size, text color and
highlighted text color.

Four new options including 'label_font_face',
'label_font_point', 'label_color' and
'label_hilited_color' have been added
to the 'style' section in 'squirrel.yaml'.

'label_color' and 'label_hilited_color' might
be moved to each scheme under the 'color scheme'
section in the future.

A few lines of code in 'SquirrelPanel.m' under
'-updateCandidates:andComments:withLabels:highlighted:'
have been refactored.