ВЕРСИИ (5)

### Added - PNG files in `glyphs/` and `items/` go into the pack. Every build copies them, so you don't have to put them under `pack/assets/` yourself. A PNG in `glyphs/` ends up at `tessera:font/<name>.png`, which a glyph with the same id already uses by default. A PNG in `items/` (subfolders work too) ends up at `tessera:item/<path>.png` and gets a flat `item/generated` model if the pack has none for it. - An item with no `model:` uses the PNG in `items/` that has its id as the file name. When it has no `custom_model_data` either, it gets `item_model: tessera:<id>`. That means `ruby.png` plus `ruby: {material: PAPER}` is enough for a working item. - The client refuses texture names with upper case letters and some other characters. Such PNGs are skipped, and the console says which file and why.