Deriving a modified Keybaord.h / Keyboard.cpp that supports modifier-keys Ctrl & Alt problems to understand what the existing code does

Hi in0,
Hi John,

@in0 thank you very much for pointing me to the doc of pgm_read
ah! pgm program-memory read.

@johnwasser
thank you very much for pointing me to this line of code.

In the meantime I started to transfer the code from the ESP32 bluetooth-keyboard HIDKeyboardTypes.h-library into the keyboard.h-lib.
I will have to think about it what makes more sense to me.
two byte-values or one word-value with bitwise "OR"-ing.

best regards Stefan