v2.1, released on 7 August 2015: incremental improvements. Added in dropshadows and parameters for controlling them. Updated and rearranged the documentation. v2.0, released on 1 August 2015: complete rewrite. The code is much cleaner and works better and more consistently. Removed all the "titlebar" options; it's better to form such things out of an entirely separate rectangle. Much more granular control over appearance. Also several "convenience" macros to allow adjusting multiple, related settings at one time. v1.0, released on 29 July 2015: initial release. All basic functionality implemented.