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Menu system for Pimoroni Pico display on Raspberry Pi Pico

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# 2bytes Pico Menu for Pimoroni Pico Display and Raspberry Pi Pico

## Requirements
* Download and setup the Raspberry Pi Pico C++ SDK
* Export `PICO_SDK_PATH` with the path to the SDK
* Get the Pimoroni SDK from [Github](https://github.com/hamid-elaosta/pimoroni-pico) or use the Pimoroni original if/when they merge the PR for portrait mode.
* Export `PIM_SDK_PATH` to point at the Pimoroni SDK

## Usage

See [example/](example/)

```C++
// Create a buffer for the screen
uint16_t buffer[PicoDisplay::PORTRAIT_WIDTH*PicoDisplay::PORTRAIT_HEIGHT];
// Create an instance of PicoDisplay (Portrait only at present)
PicoDisplay display(buffer, PicoDisplay::PORTRAIT_WIDTH, PicoDisplay::PORTRAIT_HEIGHT);
// Create an instance of PicoMenu
twobytes::PicoMenu menu(PicoDisplay::PORTRAIT_WIDTH, PicoDisplay::PORTRAIT_HEIGHT, display);

// Sample action functions
void brightnessUp(){
    // increase brightness
}
void brightnessDown(){
    // decrease brightness
}

void main() {

// Initialise the display
    display.init();
    display.set_backlight((255/100)*50); // Set backlight to 50%

// Create the main menu
    twobytes::MenuList topMenu{};
    topMenu.SetTitle("Pico Menu");

// Optionally, set the background, foreground, title background and title foreground colours, otherwise defaults will be used
    topMenu.SetTitleBackground(twobytes::MenuBase::create_pen(140,0,200)); // #600080
    topMenu.SetTitleForeground(twobytes::MenuBase::create_pen(255,255,255)); // #FFFFFF
    topMenu.SetBackground(twobytes::MenuBase::create_pen(200,0,200)); // #800080
    topMenu.SetForeground(twobytes::MenuBase::create_pen(255,255,255)); // #FFFFFF

// Add submenus and/or actions
    twobytes::MenuList brightnessMenu{};
    brightnessMenu.SetTitle("Brightness");

brightnessMenu.SetBackground(twobytes::MenuList::create_pen(0,0,0));
    brightnessMenu.SetForeground(twobytes::MenuList::create_pen(255,255,255));

// Create some new actions
    twobytes::MenuAction actionUp{};
    twobytes::MenuAction actionDown{};

// Configure actions by setting title, description and function to execute.
    actionUp.SetTitle("+ 10%");
    actionUp.SetFunction(brightnessUp);
    actionUp.SetDescription("Brightness increased by 10%");

actionDown.SetTitle("- 10%");
    actionDown.SetFunction(brightnessDown);
    actionDown.SetDescription("Brightness decreased by 10%");

// Push the brightness actions to the brightness menu.
    brightnessMenu.AddRow(&actionUp);
    brightnessMenu.AddRow(&actionDown);

// Push the brightnessMenu to the top menu
    topMenu.AddRow(&brightnessMenu);

// Add your top menu to the PicoMenu instance
    menu.SetMenu(&topMenu);

// Once we've created all of our menus and actions and added them, we only need to call menu.update() in a loop.
    while (true) {
        menu.Update();
    }

}
```

"Screen" shots :D

![Main menu in Zelda colours :D](https://raw.githubusercontent.com/2bytes/picomenu/master/images/menu.jpg) ![Sub menu in different colours](https://raw.githubusercontent.com/2bytes/picomenu/master/images/submenu.jpg)![Second submenu, different style](https://raw.githubusercontent.com/2bytes/picomenu/master/images/submenu2.jpg) ![Action description](https://raw.githubusercontent.com/2bytes/picomenu/master/images/action.jpg)

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