Add ability to directly open Dev Tools for Panels

[WizardCM]

Description

This adds "Inspect" to the context menu of browser panels, allowing for easier testing, debugging & troubleshooting for developers.

Edit: This now provides a more useful window title

Motivation and Context

It's incredibly common to access Chrome Dev Tools to troubleshoot a webpage. While users can launch OBS with --remote-debugging-port to provide a way to access Dev Tools externally, if an issue crops up on a run where the flag wasn't used, it can be impossible to debug.

How Has This Been Tested?

On Windows, right click on a Browser Panel. Select Inspect See that the inspector is focused on the element that was right clicked

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• [x] My code has been run through clang-format.
• [x] I have read the contributing document.
• [x] My code is not on the master branch.
• [x] The code has been tested.
• [x] All commit messages are properly formatted and commits squashed where appropriate.
• [x] I have included updates to all appropriate documentation.

[WizardCM]

Code is ready for review & testing on all platforms. I'll fix formatting in the second commit shortly.

[Gol-D-Ace]

This is btw. no longer compatible with older CEF versions (aka legacy build option) because of bounds.

Perhaps should put a ifdef there or remove the legacy build option.

[WizardCM]

Ah, yes probably time to remove the legacy build option, I agree.