fix setting transmit power and channel, prevent reset hang, update documentation

[jnsbyr]

This PR combines 4 changes:

• methods and members in header file order by accessibility and functionality
• moved method comments before declaration and improve some comments
• fix not being able to set the transmit power to level 0 or change the channel via config callback, also includes a fix to assign new channel number to the member variable
• improvement to prevent a indefinite loop waiting for a specific status after reset when calling reset

[nopnop2002]

Thank you.