TerminalGraphicsCommand

Borrowed Kitty graphics controls. Values retain their wire units and omission; character-valued controls use their ASCII code. IDs are unsigned 32-bit values represented as Long. Valid only during the receiving command callback. Keys retain the Kitty protocol's case-sensitive spelling: for example i selects an image ID while I selects an image number. Coordinates and sizes have not been converted from their wire units. Consumers apply operation defaults with valueOr and must not retain this reusable view.