BindControl v0.23.1

Build / release change: icons stored in ZIP archive.

Starting with this release, assuming it works as expected, BindControl will ship its ~2000 icon files in a ZIP archive instead of as individual PNG files. The main upshot of this is that unzipping the binary distribution will take dramatically less time since it doesn't have to create and populate all those tiny files. There is a slight performance hit whenever BindControl first uses a given icon file, like when creating the power picker inside PowerBinder, but this is on the order of tens of milliseconds on a reasonably fast machine. If it proves to be a problem, we'll go back to the old way.

Those running BindControl from source, via 'git clone' or downloading a source code ZIP or tarball will still have all of the loose files to contend with, though clones of the git repo will not need to re-download them over and over like source ZIP/tarball users do.