v0.4.0 – icons from the server's resource pack

• Icons match the server's resource pack: icon-source-pack: auto (default) reads the pack
  from server.properties on start (download cached by hash; also a zip path or URL). Textures it
  replaces are measured, so icons line up; items it defines become icons ("myserver:ruby"), and
  vanilla items it re-models show the new texture. Icons are placed like in the inventory: the
  whole 16×16 texture at a fixed spot, so the art sits where the texture draws it.
• No broken boxes without the server pack: Glyphwork checks whether a player loaded the server
  pack and leaves out icons that need its textures for players who did not (grid cells show a
  short name instead).
• Sturdier fonts: text, vanilla icons and server-pack icons are separate fonts in the pack.
  The client throws away a whole font when one texture is missing, so a missing texture can no
  longer take text or vanilla icons with it.

Note for testing: client mods that take over server resource packs (e.g. "Server Resource Pack
Checker") can drop the server pack as soon as Glyphwork's pack arrives. Glyphwork cannot see that;
those players get boxes for server-pack icons, or can switch to "Ohne Icons".

Downloads: Glyphwork-0.4.0.jar (plugin), glyphwork-api-0.4.0.jar (compile against it, do not shade).