Button strip UC: allow caller to supply DIB or resource string for PNG to be loaded
Interface: new function for creating some UI icons at run-time

Just a few custom DIBs now, but going forward, I'd like to create many
more icons at run-time by using Unicode glyphs.  PD has all the elements
necessary to do this (Unicode font renderer in particular), and this
would allow for excellent resolution independence for icons that can be
created this way.
Curves dialog: create some channel icons at run-time
Curves dialog: simplify interface

One of the recurring goals of this release is: SIMPLIFY SIMPLIFY
SIMPLIFY.  PD has a lot of complex dialogs, and anything we can do to
trim them down is desirable.

To that end, the Curves dialog has been separated into two panels: the
basic curves tool, and display options.  New users can happily ignore
the "display options" panel and simply focus on the tool itself, while
advanced users are welcome to customize the interface to their liking.
Curves dialog: minor UI adjustments
Add button strip support to PD's command bar (presets, last-used settings, etc)

Man, I love PD's command bar.  Such a lifesaver when building new UCs!