Add support for graphical debug, to be used during ACPI phase

Cargo.toml

res/unifont.font

src/arch/x86_64/debug.rs

src/arch/x86_64/graphical_debug/debug.rs

src/arch/x86_64/graphical_debug/display.rs

src/arch/x86_64/graphical_debug/mod.rs

src/arch/x86_64/graphical_debug/mode_info.rs

src/arch/x86_64/graphical_debug/primitive.rs

src/arch/x86_64/macros.rs

src/arch/x86_64/mod.rs

src/arch/x86_64/start.rs