Add "cmake.ignoreCMakeListsMissing" (#2532)

[ilg-ul]

This change addresses item #2532

This changes visible behaviour

The following changes are proposed:

• add the boolean cmake.ignoreCMakeListsMissing option at the end of the list
• add the boolean ignoreCMakeListsMissing member to the ExtensionConfigurationSettings interface
• if this option is set, skip asking the user what to do if CMakeLists.txt is not found in the project root

Other Notes/Information

• the option is defined in the resource scope, but it is only checked in the this.workspaceContext.config
• the option has an even emitter, but for now it is not used
• there are no i18n messages

[ghost]

All CLA requirements met.

[ilg-ul]

@bobbrow, what do you think about adding "cmake.ignoreCMakeListsMissing": true to the .vscode/settings.json?

[bobbrow]

@bobbrow, what do you think about adding "cmake.ignoreCMakeListsMissing": true to the .vscode/settings.json?

cmake.sourceDirectory is already set, so that shouldn't be necessary for this project.

[bobbrow]

Oh, actually, one last thing I forgot. Could you add a line in the CHANGELOG.md in the "Improvements" section to mention your change and give yourself credit? Follow the examples in the file.

[ilg-ul]

... CHANGELOG.md

Done.

[ilg-ul]

Great!

Thank you for your help!