Furthermore, I did a small refactoring of the naming conventions for the
enum functions. Instead of vague terms liek value and string, they are
now called u8_to_enum, str_to_enum, or enum_to_str.
Application is now able to set the types (Key, Mouse, MouseKey, String),
which are saved in a struct, with a function. Furthermore, the
application can check the returned type of the board with a match.
This commit also implements the append string functionallity.
This commit included quite a lot of changes:
* The application arguments are now divided in a read and a write part.
This is realized through structopt subcommands.
* The read and write commands are recognized in a match construction
which takes place after the device is opened.
* I refactored some of the error messages and added more error messages
* The pedals_read() function now is able to read 1, 2, or 3 pedals.
Furthermore, the table is now redrawn with box drawing symbols.
* The write function is tested and successfully writes a key to the
device
In hidapi v0.4.1 it is not yet possible to store the HidDevice in a
struct. Although there is already a pull request to implement this, it is not yet merged.
The read function is now moved into the Pedals object and split up to
read_pedals() (which reads all pedals and prints the output) and
read_pedal() (which only reads one pedal).
Furthermore, the beginning of write_pedal() and write_pedals() is added.
