Logic channel color sequencing

[jgartrel]

I humbly beseech the maintainers that be, that they might accept this pull request. I know this might seem pedantic, however, most manufacturers of ribbon cable in the last 20 years start with brown, red ... with black next to white at the other side of the cable (for 10 wire, or 40 wire ribbon cable).

This pull request adds an option to the view settings to change the color offset for the logical channels. This allows a user to set the first color used for channels to be brown (or some other color) by default (instead of black)

Setting a value of "1" for the "Logic color offset" assigns brown as the color for channel 0, red as channel 1, etc... This has the following benefits:

1. It better matches the most common manufacturing sequencing for colored ribbon cables.
2. This works better with the cheapest available logic analyzers. These are very common and the GND signals are placed in positions 9 and 10. If position 10 was black that would equate to the GND return for most of these cheap analyzers.

The default for the color offset is: "0", allowing for the traditional look of pulseview to remain unchanged and work well with the Saleae logic analyzers that use black for channel 0.

I did my best with the translations for German, Spanish, Japanese, and Chinese. Those will certainly need a review.