Terminal construction previously accepted GhosttyTerminalOptions with
dimensions and one scrollback byte limit. Remove the options struct from
the ABI and make ghostty_terminal_new accept columns and rows directly.
Add byte and line limit options to ghostty_terminal_set and forward them
to the runtime Terminal setters. NULL removes a limit, while zero bytes
disables scrollback. Update type metadata, tests, and all API examples.
Add set/get support for foreground, background, cursor, and palette
default colors through ghostty_terminal_set and ghostty_terminal_get.
Four new set options (COLOR_FOREGROUND, COLOR_BACKGROUND, COLOR_CURSOR,
COLOR_PALETTE) write directly to the terminal color defaults. Passing
NULL clears the value for RGB colors or resets the palette to the
built-in default. All set operations mark the palette dirty flag for
the renderer.
Eight new get data types retrieve either the effective color (override
or default, via DynamicRGB.get) or the default color only (ignoring
any OSC overrides). Effective getters for RGB colors return the new
NO_VALUE result code when no color is configured. The palette getters
return the current or original palette respectively.
Adds the GHOSTTY_NO_VALUE result code for cases where a queried value
is simply not configured, distinct from GHOSTTY_INVALID_VALUE which
indicates a caller error.
