headless awt, -g switch, stereotype improvements
headless awt, -g switch, stereotype improvements

* sprites now generated in headless mode, vastly improving
  generation speed
* added `-g` switch, which will regenerate the .ini file for
  the icons specified, or, if the .ini file given by the -c
  switch already exists, update that file with missing
  sections and remove invalid sections, while preserving the
  existing valid config.
* improved handling of long-form names, which now have their
  stereotype names split over multiple lines
* stereotype names for the large icons are now bolded to
  differentiate, instead of marked with '*'

milo-minderbinder/AWS-PlantUML