Contribute to the language status

[isidorn]

Hi VS Code PM here 👋

Currently the C++ extension contributes individual items to the status bar. On my macOS I see the Mac item in the status bar. I also see some progress items like the occasional flame icon (pictures).
I suggest to use the language status bar, Typescript is already using this (picture attached).

This way all the C++ status bar items will come under a common item making the whole status bar experience cleaner for our users.

The status bar items which are actually progress our current advise is to use the withProgress-API. With that you announce a long running thing to VS Code. Our current thinking is to add a new progress location which is the extension’s language status. With that we can render something on the composite item as well as on the item itself. This is being discussed here, please chime in.

fyi @bobbrow @jureid @jrieken @egamma