Opponent analysis

[Siderite]

Add a button to player popups that when clicked will show a dialog with detailed info:

• consider here the existing warning for disconnecters
• see existing chrome extensions that do this, more or less:
  • Lichess Opponent Information - https://chromewebstore.google.com/detail/lichess-opponent-informat/ldopalelffalhfdpfnljnepkglbocdgg
  • Lichess Opponent Form - https://chromewebstore.google.com/detail/lichess-opponent-form/lipplpkgbnhdfdchoibgafjdblpjdkpi
  • Archetypes - https://chromewebstore.google.com/detail/archetyped-know-you-your/igcflbhhhlnomjdjcmamnlmkaiaoilpj
  • Lichess custom stats - https://chromewebstore.google.com/detail/lichess-custom-stats/ppolcdjceepccgcemodacgafjcoaemlh