Handle tokens

[sneurlax]

See:

fusiondart/lib/src/output_handling.dart

Line 88 in 3d12b74

// TODO check for tokens, maturity, etc.

fusiondart/lib/src/models/transaction.dart

Line 107 in 3d12b74

// TODO handle tokens.

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and

fusiondart/lib/src/models/transaction.dart

Line 272 in 38f69c7

// TODO handle tokens!

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Or we can assume and advertise that tokens ought not be used with this package.

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We assume that special outputs like those with tokens (CashTokens, SLP) are filtered out before being fed into fusiondart. This has been documented in the README