Draft: add a config param to specify protocols allowed os execution

[HashidaTKS]

Which issue(s) this PR fixes:

https://github.com/ThinBridge/Chronos-SG/issues/305

What this PR does / why we need it:

Some sites, especially web meeting sites, do not work correctly because of the OnProtocolExecution implementation.

• Zoom does not work without browser->StopLoad() when allow_os_execution is false.
  • If allow_os_execution is true, browser->StopLoad() is not needed.
• Webex does not work if browser->StopLoad() is executed.

To be able to work those site correctly, this patch introduces AllowedProtocols to the config file and improve the OnProtocolExecution implementation.
If a protocol is allowed to execute on OS, do not execute browser->StopLoad().
If a protocol is not allowed to execute on OS, execute browser->StopLoad().

Here is the AllowedProtocols usage:

AllowedProtocols=|zoommtg:|webex:|

How to verify the fixed issue:

How to verify the fixed issue:

• Open ChronosDefault.conf or Chronos.conf
• Add AllowedProtocols=|ms-teams:|zoommtg:|webex:| to the config file.
• Save the config file
• Start Chronos
• Open the Zoom meeting room.
  • Confirm that a popup to confirm executing the Zoom native app is displayed.
    • 
• Click the "Join" button
  • Confirm that Chronos does not crash
  • Confirm that the meeting room is displayed
• Open the Microsoft Teams meeting room
  • Confirm that a popup to confirm executing the Microsoft Teams native app is displayed.
    • 
• Click the "Continue to the browser" button
  • Confirm that Chronos does not crash
  • Confirm that the meeting room is displayed
• Open the Webex meeting room
  • You can create and join a meeting room by logining to the Webex site
    You need to register to the Webex beforehand
  • Confirm that a popup to confirm executing the Microsoft Teams native app is displayed.
    • 
• Click the "Join from this browser" button
  • Confirm that Chronos does not crash
  • Confirm that the meeting room is displayed
• Close Chronos
• Open ChronosDefault.conf or Chronos.conf
• Change AllowedProtocols to AllowedProtocols=
• Save the config file
• Start Chronos
• Open the Zoom meeting room.
  • Confirm that a popup to confirm executing the Zoom native app is not displayed.
• Click the "Join" button
  • Confirm that Chronos does not crash
  • Confirm that the meeting room is displayed
• Open the Microsoft Teams meeting room
  • Confirm that a popup to confirm executing the Microsoft Teams native app is not displayed.
• Click the "Continue to the browser" button
  • Confirm that Chronos does not crash
  • Confirm that the meeting room is displayed
• Open the Webex meeting room
  • You can create and join a meeting room by logining to the Webex site
    You need to register to the Webex beforehand
  • Confirm that a popup to confirm executing the Microsoft Teams native app is not displayed.
• Click the "Join from this browser" button
  • Confirm that Chronos does not crash
  • Confirm that the meeting room is not loaded
    • Note: This is feel like a bug but a Webex site specification.
• Close Chronos
• Open ChronosDefault.conf or Chronos.conf
• Change AllowedProtocols to AllowedProtocols=*
• Save the config file
• Open the Zoom meeting room.
  • Confirm that a popup to confirm executing the Zoom native app is displayed.
    • 
• Click the "Join" button
  • Confirm that Chronos does not crash
  • Confirm that the meeting room is displayed
• Open the Microsoft Teams meeting room
  • Confirm that a popup to confirm executing the Microsoft Teams native app is displayed.
    • 
• Click the "Continue to the browser" button
  • Confirm that Chronos does not crash
  • Confirm that the meeting room is displayed
• Open the Webex meeting room
  • You can create and join a meeting room by logining to the Webex site
    You need to register to the Webex beforehand
  • Confirm that a popup to confirm executing the Microsoft Teams native app is displayed.
    • 
• Click the "Join from this browser" button
  • Confirm that Chronos does not crash
  • Confirm that the meeting room is displayed
• Close Chronos