Fix pinout selection

[bschulz1701]

Improve the way pinout is selected between various margay boards

[bschulz1701]

By reading the EEPROM logger info this could be made automatic.

I propose making multiple options:
Margay Logger(Model_1v0); Forces the logger instatiated to use the Model_1v0 parameters, or any other board options
Margay Logger(Auto); Reads the serial number written to the EEPROM, checks the board type, and chooses the appropriate logger based on this. Should default to most recent production version.

Code (Proposed, but untested:

In Margay.h

enum board
{
    Model_0v0 = 0,
    Model_1v0 = 1,
    Auto = 255
};

In Margay.cpp

Margay::Margay(board Model_)
{
	if(Model_ == Auto) {
		unsigned int Len = EEPROM.length(); //Define local shorthand for length
		unsigned int Val = (EEPROM.read(Len - 8) << 8) | (EEPROM.read(Len - 7)); //Get device ID bytes of SN
		switch(Val) {
			case 0x4D00:  //Check against serial number ID of model v0.0
				Model_ = Model_0v0;  //Overide model definition
				break;
			case 0x4D01: //Check against serial number ID of model v1.0
				Model_ = Model_1v0;  //Overide model definition
				break;
			default:
				Model_ = Model_1v0; //Overide with most recent production version
			...
		}
	}


	//Define model params as normal. Either using forced model name, or overwritten model name due to auto selection
	if(Model_ == 1) {  
		...
	}

	else if(Model_ == 0) {
		...
	}

	Model = Model_;
}