Separate controller and bootloader into their own modules

firmware-updater/src/bootloader.rs

firmware-updater/src/main.rs

tele0592/examples/check-firmware.rs

tele0592/examples/simple.rs

tele0592/src/bootloader.rs

tele0592/src/controller.rs

tele0592/src/device.rs

tele0592/src/lib.rs