add note in todo about potential loss of data when > 4096 bytes of data
are entered into a message box and sent to Pd

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)

from pd-l2ork: 9e88d7ac62c7c4a2717efe7953ac2165e1c5b816

from pd-l2ork: fb109233c5b8c2ed4bbc5d0f7598cff4e2ed7a10

from pd-l2ork: 1697d5382a8bc7fbafd11c58e9278f6e73c2fc8e

from pd-l2ork: 4c18e0103458446e9285967d9eab5b58ffc72322