Implement custom Fusion modes

[sneurlax]

See

fusiondart/lib/src/output_handling.dart

Lines 692 to 706 in 67986f1

	// TODO implement custom modes.
	/*
	if (mode == 'custom') {
	String selectType = walletConf.selector[0];
	double selectAmount = walletConf.selector[1];
	if (selectType == 'size' && sumValue.toInt() != 0) {
	fraction = COIN_FRACTION_FUDGE_FACTOR * selectAmount / sumValue;
	} else if (selectType == 'count' && selectAmount.toInt() != 0) {
	fraction = COIN_FRACTION_FUDGE_FACTOR / selectAmount;
	} else if (selectType == 'fraction') {
	fraction = selectAmount;
	}
	// Note: fraction at this point could be <0 or >1 but doesn't matter.
	} else */

[sneurlax]

This isn't in the design, so I'm assuming it's not needed insofar as Stack might need it. Maybe we should compromise and implement it as an optional parameter?

[sneurlax]

The fusiondart scaffolding required in order to use default modes has been added. Custom modes have not been implemented. See afe3e34