Add ability to add custom LED order matrix

[waterbury]

I have an LED matrix PCB with 4 LEDs per button. The LEDs aren't grouped in button order. I had some code on another microcontroller to deal with this. Please refer to the code block below. Also, using this scheme perhaps allow a low current version that only uses 1 LED from each button.

//Holds Button 1-20 LED location. Order NW, NE, SW, SE. ie. buttonLEDs[0] houses position of button 1 NW LED, buttonLEDs[4] houses position of button 2 NW LED. LED starts at position 1.
int buttonLEDpos[80] = { 25, 26, 24, 23    ,    9, 10, 8, 7   ,   27, 28, 22, 21    ,   11, 12, 6, 5    ,
                       29, 30, 20, 19    ,   13, 14, 4, 3   ,   31, 32, 18, 17    ,   15, 16, 2, 1 };

[waterbury]

This change to neopicoleds.cpp works as a hack. I'll try to implement an better change tomorrow and submit
Line 334:
`
std::vector<std::vector> NeoPicoLEDAddon::createLEDLayout(ButtonLayout layout, uint8_t ledsPerPixel, uint8_t ledButtonCount)
{
vector<vector<uint8_t>> positions(ledButtonCount);
int buttonLEDpos[80] = { 25, 26, 24, 23 , 9, 10, 8, 7 , 27, 28, 22, 21 , 11, 12, 6, 5 ,
29, 30, 20, 19 , 13, 14, 4, 3 , 31, 32, 18, 17 , 15, 16, 2, 1 };
/*
for (int i = 0; i != ledButtonCount; i++)
{
positions[i].resize(ledsPerPixel);
for (int l = 0; l != ledsPerPixel; l++)
positions[i][l] = (i * ledsPerPixel) + l;
}*/

for (int i = 0; i != ledButtonCount; i++)
{
	positions[i].resize(ledsPerPixel);
	for (int l = 0; l != ledsPerPixel; l++)
		positions[i][l] = buttonLEDpos[ (i * 4) + l ] - 1;
}	

`

[TheTrainGoes]

Hey @waterbury ,

Would you mind re-submitting this on the new GitHub?
https://github.com/OpenStickCommunity/GP2040-CE/issues/