Set difficulty for libuplink and testplanet larger than 8, because we use last byte in the node id to store the version number, so the difficulty must be larger than 8.
* added scopelint and correcte issues found
* corrected scopelint issue
* made updates based on Ivan's suggestions
Most were around naming conventions
Some were false positives, but I kept them since the test.Run could eventually be changed to run in parallel, which could cause a bug
Others were false positives. Added // nolint: scopelint
