First public release for Paper 26.2.

• Shift + right-click a placed item frame with shears to hide the frame; the item inside stays visible.
• Empty hidden frames stay visible so they can be found and broken, and hide again once an item is placed.
• Rotation of a hidden frame is locked behind Shift + right-click.
• Right-click on a hidden frame that hangs on a container opens the container, respecting protection plugins.
• Frames made invisible by other plugins or commands are adopted on chunk load, on interaction and on /uf reload.
• Commands /uf reload, /uf scan [radius] and /uf toggle, permissions unseenframes.use and unseenframes.admin.
• Everything configurable in config.yml, all messages in MiniMessage.
• Folia-compatible, anonymous usage statistics via bStats.