v1.1.0 – GUI sprites, picture sizes and one pack for the client

Everything here is new; menus, configs and plugins made for 1.0 keep working unchanged.

• GUI sprites as icons: icon: "gui:hud/heart/full", gui:mob_effect/speed,
  gui:statistics/item_crafted, gui:icon/checkmark and about 100 more (hearts, food, armor, air,
  every status effect, statistics, small icons) wherever an item id goes, in YAML and the API. Drawn
  from the client's own textures at their own size in the middle of the icon place; sprites in the
  plain dialog; the menu designer shows them after loading a client jar again.
• Docs: <sprite:...> and <head:...> work in tooltips, titles and messages.
• Pictures in other sizes: width / height (the other side follows the aspect ratio) or
  scale on an image element. Glyphwork resizes the picture when it builds the pack and adds it
  as an extra picture; YAML menus add their sizes by themselves, plugins announce theirs with
  Glyphwork.get().imageSize("logo", 32, 0) / imageScale(...) and draw them with
  Image.size(w, h) / .scale(s) (experimental). The menu designer shows the size. Without sizes
  the pack stays exactly as before.
• One pack for the client: pack.include-source-pack: true puts the server's own resource pack
  (icons.source-pack) into the Glyphwork pack; its pack.mcmeta and pack.png are kept, Glyphwork's
  own files win. Empty resource-pack= in server.properties then. Helps with client mods that keep
  only the last server pack, and saves merging by hand as with hosting: provided.
• Menu designer: Glyphwork version. Pick the version your server runs: newer settings are hidden
  or marked, and the check list names everything that needs a newer version. The docs mark what
  came after 1.0 with since 1.1.