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The at24 EEPROM decoder's previous implementation happened to access
caller's data even after the .decode() method invocation ended, and
their content has changed or the data was not valid any longer.
Get deep copies for those details which broke the test suite. Prepare
"generous" deep copies for other data which currently doesn't trigger
exceptions, but might be waiting for an accident to happen. Careful
inspection of the complex implementation and relaxing the current greed
of this commit remains for future commits. Comment heavily for awareness.
It is assumed that the 'databyte' name is misleading. And that much of
this upper layer decoder's complexity would be obsoleted by the lower
layer decoder's providing more useful packets (bytes and their ACK state,
read/write phases of transfers, complete transfers up to STOP, etc).
This commit does not address those readability or layering concerns.
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Only add items to 'outputs' if the respective PD actually has
OUTPUT_PYTHON support implemented as of right now.
Various decoders might get OUTPUT_PYTHON support later, but the
'outputs' field should reflect the current status.
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Move initialization code of protocol decoders from the constructor to a
new reset() helper method. The libsigrokdecode backend could run this
method several times to clear the decoder's internal state, before new
data from another acquisition gets fed to decode() calls.
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This is not really relevant for stacked PDs currently (they can be used
unmodified with either PDv2 or PDv3 low-level decoders), but it'll allow
us to drop PDv2 support completely.
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Remove the FSF postal address as it might change (it did in the past).
Reference the gnu.org website instead which is more stable.
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The previous **kwargs some PDs had is not actually ever used, so drop it.
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This is more consistent with annotation syntax and looks slightly
better in most cases.
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