Various minor fixes + robustify

[emaheuxPEREN]

• README: fix required versions
• Better tshark command invocation + remove unused attributes
• Simplify Payload logic + handle headers containing non ASCII characters (e.g. µs) + robustify parsing
• Proper HTTP2 data handling in all cases
• HAR output: allow to export plain-text containing special (non-printable) whitespaces (no base64 encoding)
• Populate optional HAR fields for entries: connection with community ID and serverIPAddress
• Handle failed decompression by tshark (e.g. 'content-type: encrypted' for yandex, or mis-declared 'content-type: gzip', e.g. for appbaqend)