html scraper - URL processing

[MMikePL]

extend HTML Scraper module

added:

• scrape links from given URL, not only file

modified:

• check for URLExtract depenency in init (raise CuckooDependencyError if needed)
• adjust log messages and levels

[doomedraven]

thank you, f-strings is not good for logging, there is issue about that in capev2 repo, fixed that