added one more k12 object and updated pd.tk to reflect new items in the k12 menu (including new minimum size)

added new abstractions to the K12 module (still need to integrate it into pd-l2ork and add help files)

numerous fixes and improvements to abstractions and help files including reworked image drawing logic, improved metronome preset ordering and updated presets throughout the demo and help files, improved icons, clean-up and optimization, beter enveloping, and more.

finished importing the remainder of new K12 module abstractions, updated GUI to reflect them, improved key press capture, reformatted GUI object menu inside K12 mode to allow for more space