Move MIME-type detection from class CFileUtils to right class CMime
Mime::parseMimeType: simplify parsing code
Mime: add detection of basic types by file content
ScraperUrl::Get: Better detect archives and report result of unpacking
Merge pull request #3986 from Karlson2k/fix_mime_01

Fix archive processing by ScraperUrl after 872de5f2fb21d155a0c1a51d7aadf8a70133cbe4