Update the author color generation. Now, instead of generating
an entire hex string based on the user id, the user id instead
is used to generate a hue value. After this hue value is created,
there is some logic to tweak first the lightness and then saturation
values to achieve a readable color (in contrast to the background).
This change makes it so that user colors will not vary as wildly
between the different themes.
The values still are not cached and still do not update
initially when the theme is changed. Both of these things
will be resolved.
work regardless of the theme choices the user makes. The code
now incorporates the contrast between the background color and the
color generated by the user_name when picking colors. It currently
has two 'big' issues:
1. Colors are not cached. I am planning on adding a QHash for this
a little later. This should improve performance by not calculating
the color for the same users over and over and over again.
2. Theme changes do not trigger the colors to get refreshed.
Currently, you will have to switch to a different room and back
to get the colors to refresh.
