voices - round robin and shit (and [voices~]) about pd-else HOT 4 OPEN

uma voz livre mas ainda em release deve ter prioridade com uma voz presa na hora de ser roubada

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implement true non round robin mode

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check vanilla's resize method

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• add 'split' mode/features to [voices] or something / discussion in #1388

• hold/free method for [susloop]

• resizing issues - just clear, like in pure-data/pure-data#661? (or flush only the extra voices?)

• release value for each voice?

• '-list' for MC? 1st output is list of frequencies, 2nd output is list of velocities. [voices~] is just a wrapper around this and something that already sends multuchannel signals by including [f2s~]. This wil work the same way as VCV deals with polyphony.

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