improve rendering on zoom out of traces

[BenGardiner]

This PR is proposing a few things to make zoom out on the traces fit more decodes -- each is logically separated into its own commit.

• provide more format options to sigrok for shorter decodes of ID and Data (e.g. strip '0x')
• provide the string of payload bytes in the longer 'data' / 'Payload' annotation
• swap the row for the 'data' / 'Payload' annotation so it is in the 'Payload' row. rationale: it is a long annotation which spans multiple 'fields' so fits better in that row. As a bonus the user can hide the bits and fields rows and just look at the equivalent of a candump log output format on the traces
• skip python byte escaping for the ascii half of the decoded format when the hex+ascii option is selected and either skip indv characters or use the hexdump -C way of printing a .

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[kentindell]

Nice!