Continuum 93 V 0.1.4

Features

- Replaced the implementation of interrupt 0x02, function 0x00 (Read Keyboard State). This was not working as intended and it was replaced with an implementation built from scratch;

- Introduced a new interrupt for the keyboard state: interrupt 0x02, function 0x10 (Read keyboard state as code bytes).

This is a bit more compact and practical to use in many situations.

Documentation

- Updated the manual to cover the understanding of how the keyboard state works;

- Updated the interrupt reference;

Internals

- More unit tests some of which were supposed to be in already.