move to workspace architecture in preparation for radio stuff

Cargo.lock

Cargo.toml

companion-software/Cargo.toml

companion-software/build.rs

companion-software/memory.x

companion-software/src/buffered_display.rs

companion-software/src/controller.rs

companion-software/src/drivers/mod.rs

companion-software/src/drivers/st7789.rs

companion-software/src/gui/button.rs

companion-software/src/gui/chat.rs

companion-software/src/gui/chat_list.rs

companion-software/src/gui/contact_view.rs

companion-software/src/gui/mod.rs

companion-software/src/gui/scroll_tracker.rs

companion-software/src/gui/selector.rs

companion-software/src/gui/status.rs

companion-software/src/gui/textbox.rs

companion-software/src/keyboard.rs

companion-software/src/main.rs