Temporary override. [1765]
Add swingx-common to dependencies. [1765]
Save recent color swatch selections. [1765]

This ended up having to be more complicated than I had hoped, but it’s
functional!

There’s a number of refinements that I’ll have to make to get this
functioning *exactly* like the standard swatch panel, but the majority
of the work is done.
Actually call the new swatch code. [1765]

D’oh. :(
Cleaning things up. [1765]
Use JDK default color for empty "slots".

This allows us to get rid of the (now) redundant “defaultColor” static
field. Also did a little parenthetical cleanup.

[1765]
Allow use of an initial color selection. [1765]
Some accessibility improvements. [1765]

Just trying to bring things up to par with the official JDK behavior.
So far it’s mostly just setting properties that screen readers can use
(and using locale-specific labels).

I still need to get tooltips and keyboard navigation of both the “main”
and “recent” swatch panels working before this could be considered
functionally equivalent to the official swatch stuff.
RGB values now appear as tooltips. [1765]