2.1.231 Beta

This is a release candidate for "2.1 patch" milestone.

• Multiple improvements in our TCP stack implementation #45, #92, #98, #101, #106, #109, #110, #112
• Moved firewall icons-cache to Cache folder to be able to clear it from app settings #89
• Fixed unnecessary restart of protection in Proxy mode #90
• Proxy mode: DNS cache is now flushed on network reconnect #91
• Multiple GUI improvement in Low-Level Settings #94, #96, #97, #103
• Optimized Pcap functionality in Low-Level Settings #97, #105
• Update channel options are hidden for Amazon builds #102
• Fixed handling of HTTP CONNECT requests without Host header #113
• Small fix in UI of Send Feedback activity #118