change fielddesc_getfloat to fielddesc_getcoord so that the (admittedly arcane) scaling/quanta syntax can be used with [draw] methods where it makes sense

do a proper loadbang for canvas fields (needs more testing)

(differs slightly from mine in that the '-' character is used to mean
 a wildcard template)

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from pd-l2ork: a620228554d1662bacd0f2f8cfc65259049164ec

 by Gilberto"
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from pd-l2ork: 7c485f595a430ac4539d67d091390f08c69f08c8

  regressions)"
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