Description
Add support for the new loader override options documented by ICoreWebView2ExperimentalEnvironmentOptions.
ReleaseChannels
Should be a series of check boxes of which channels to search. By default all should be checked. If all are checked then we shouldn't be writing to the reg or env var since this is implied by no entry in env var or reg. Consider disabling the check boxes if a browser executable folder is selected (since that wins over this).
Set the value to a comma-separated string of integers, which map to the COREWEBVIEW2_RELEASE_CHANNELS values: Stable (0), Beta (1), Dev (2), and Canary (3). For example, the values "0,2" and "2,0" indicate that environment creation should only search for Dev channel and the WebView2 Runtime
Environment Variable: WEBVIEW2_RELEASE_CHANNELS
Registry: ...\ReleaseChannels