Inkplate2 text not displayed until text color is set, but text color command is not implemented in peripheral mode

[bivanbi]

Steps to reproduce:

1. Load Inkplate2_Peripheral_Mode from InkplateLibrary examples
2. clear display, add hello world text and display framebuffer via serial, eg.:

   #K(1)*
   #C("48454c4c4f20574f524c44")*
   #L(1)*
   

3. Observer blank white screen after refresh

Workaround: Add text color command, e.g.:

            case 'H':
                // Set text and background color
                sscanf(s + 3, "%d,%d", &foreGroundColor, &backGroundColor);
                display.setTextColor(foreGroundColor, backGroundColor);
                break;

Then:

1. clear display, set text color, add hello world text and display framebuffer via serial, eg.:

   #K(1)*
   #H(2,0)*
   #C("48454c4c4f20574f524c44")*
   #L(1)*
   

2. Observe red 'HELLO WORLD' text on white background after refresh

Also the documentation lacks the setTextColor method:

[rsoric]

Greetings @bivanbi ,

thank you for your contribution, we have half-completed a new Inkplate peripheral mode which should contain all these commands. We will however still review your PR regarding this and see if we can implement it to the existing example for Inkplate 2.

-Rob