Your own menus and HUD panels

New in 0.3, module menus, off by default. An owner composes client screens of their own - a /menu of warps, say - and HUD panels, as lines the editor shows. The game's own screens and other mods' screens are never restyled.

• buttons: one line per button, menu | label | icon item | command | permission | tooltip: warps | Spawn | minecraft:compass | spawn warps | Mine | minecraft:iron_pickaxe | warp mine | | The mining world The command runs as the player who clicks, with their own permissions - a button never lets anybody do more than they could type. Permission and tooltip may be left out; a button with a permission is shown only to those who hold it.
• titles: a menu's title, warps | Warps; [en]…[cs]… works.
• permissions: who may open a menu, staff | keystone.menu.staff. A menu not named here is for everybody with keystone.menu.

/menu <menu> opens it; with Keystone's client half as a screen of buttons with item icons.

• hud: one line of text each, panel | text. Any HUD value fills in - {coins}, {server.tps}, {vote.streak}, {player}, {x} {y} {z}, {fps} and the rest (HUD values): info | Online: {server.online}.
• hud-titles: a panel's title and where it starts: panel | Title | top-right (top-left, top, top-right, left, right, bottom-left, bottom-right). The player may move it like any other HUD element unless the server locks it.
• hud-permissions: who sees a panel, panel | permission; not named, everybody.

GET /v1/menus (scope players.read) lists the menus and panels as written. Addons and modules run commands as a player the same way through Player.runCommand.