Some tweaks for Teams

Currently implemented features:

• Support for both Teams Classic and New Teams
  • Tweaks may apply to one or both
• Configuration through %LOCALAPPDATA%\teamsplus\config.ini (Settings button)
• CEF DevConsole (Debug button)
• Always on Top toggle (AOT button)
• Split to two panels with a movable separator
  • Clone button: Clone the same session
  • Open a new session to log in with multiple accounts at the same time
    • Secondary button: Persist the session
    • Temporary button: Forget session data after closing
• UI tweaks
  • Remove "Help" and "Download desktop app" buttons
  • Change background colour or background image of the header
  • Change background colour or background image of the chat pane
• Links open in the default browser
• Make the first video feed fill the whole window (Focus button)

Currently implemented configuration values:

• config.cleanup, values: true, false, default: true
• config.cleanup-secondary, values: true, false, default: empty (use primary setting)
• theme.headerbg, values: #<HEX>, <URL>
• theme.headerbg-secondary, values: #<HEX>, <URL>
• theme.chatbg, values: #<HEX>, <URL>
• theme.chatblend, values: float between 0.0 and 0.1
• theme.chatbg-secondary, values: #<HEX>, <URL>
• theme.chatblend-secondary, values: float between 0.0 and 0.1

Known bugs:

• UI tweaks sporadically don't get applied
  • document.querySelector and document.getElementById fails a lot, no fix yet
  • Workaround for some: Change pages once
• Focus button sporadically doesn't work
  • Workaround: Click somewhere in Teams and try again within one second
  • This is a browser security feature