Improve Code Quality and Readability of ManagedBlink1

[vejuhust]

The following improvements on ManagedBlink1 solution were made in this pull request:

• Remove unused 'using'
• Fix typo and misspelled words
• Improve readability of test cases in Blink1.ConsoleDemo
• Adjust const NumberOfPreset for mk2 device

If you want to modify/reject part of them, feel free to let me know.

[todbot]

Thanks!