Updated get.py with ability to verify extracted files and skip if ok

[PilnyTomas]

New features:

• Detects corrupted archives (for example not completely downloaded) and automatically re-downloads them (the corrupted archive is renamed with a suffix ".corrupted)
• Detects incomplete extraction (checks only missing filenames - intentional corruption such as changing contents of files is not expected and not detected) - incomplete extraction triggers new and complete extraction
• Updated download report to show download speed and elapsed time
• New parameters:
  • '-v' Verbose - displays more info
  • '-d' Force download all archives (skipping checks)
  • '-e' Force extraction (skipping checks)
  • '-f' Force both download and extraction (skipping checks)

Test scenarios (only on Linux)

• Fresh - nothing is downloaded, nothing is extracted
  • Time to complete: 2m51.901s
• Downloaded - only full extraction
  • Time to complete: 1m22.337s
• Already installed - only performing checks - nothing is missing
  • Time to complete: 0m45.402s
• Multiple corruption - 1 missing archive, 1 archive not downloaded properly, 1 archive not extracted at all, 1 file missing
  • Handled without error or crashing - all tools installed

[me-no-dev]

Closed in favor of: #8720