/// Specifies a bitmap font for a board.
///
/// Each board can optionally specify a font image and tile dimensions.
/// When absent, the app's default embedded CP437 font is used.
#[derive(Clone, PartialEq, Eq)]
pub struct FontSpec {
    /// Path to the PNG font image, relative to the working directory.
    pub path: String,
    /// Width of each tile in the font image, in pixels.
    pub tile_w: u32,
    /// Height of each tile in the font image, in pixels.
    pub tile_h: u32,
}