Add basic display primitives for zephyr

[MaartenS11]

Adds the following primitives to Zephyr:

• display_setup
• display_set_orientation
• display_width
• display_height
• display_fill_rect
• display_draw_string

Additionally, this PR also brings millis to Zephyr + the new random int primitive random_int.

Note

The display drivers can be disabled at compile time by setting CONFIG_DISPLAY to n in prj.conf.

Currently designed for 16bit color displays (buffer size needs to be changed for others).

Important to note, on little endian hardware this is what a color looks like:

  7......0 15.....8
| gggBbbbb RrrrrGgg | ...

function drawText(x: i32, y: i32, str: string, foreground: i32, background: i32): void {
  draw_text(x, y, String.UTF8.encode(str, true), String.UTF8.byteLength(str, true), foreground, background);
}

export function main(): void {
    setup();

    initDisplay();

    drawText(0, 32, "TOPLLAB/WARDuino", 0xffff, 0x0000);
    drawText(0, 32 + 16, "PR#337 demo", 0xff, 0x0000);
    drawText(0, 32 + 32, "Hello there from WARDuino!", 0xffff, 0x0000)
    drawText(0, 32 + 16 * 3, "width = " + displayWidth().toString() + ", height = " + displayHeight().toString(), 0xffff, 0x0000);

    const time = 5000;
    while (true) {
        digitalWrite(Pin.led1, PinVoltage.HIGH);
        drawRect(0, 0, 32, 32, 0b1110000000000111); // Green square
        delay(500);
        digitalWrite(Pin.led1, PinVoltage.LOW);
        drawRect(0, 0, 32, 32, 0xFFFF);
        delay(500);
    }
}