Keep memory dump sparse

[kitlith]

microcorruption-dumper/pkg/mcorrupt.user.js

Lines 23 to 27 in 9bd68f9

	// cpu.memory is a sparse js 'array', let's convert it to a full 64KiB array before downloading
	var memory = new Uint8Array(0x10000);
	for (key in cpu.memory) {
	memory[key] = cpu.memory[key];
	}

Currently, I am converting the sparse array into a full 64KiB array before creating an ELF with it. instead, we can create a section for each set of consecutive addresses and save on filesize.