Ship OnionShare 2.x

Originally created by @Anonymous on #14649 (Redmine)

• test new features
  • receiver mode
  • publish website
• hide Tor settings i.e. fix #16913 (closed), thanks to https://github.com/micahflee/onionshare/issues/1014

Related issues

• Related to #15549 (closed)
• Related to #11929 (closed)
• Has duplicate #15326 (closed)
• Blocks #16913 (closed)
• Blocks #18256 (closed)