Allow to navigate to plasticscm.com/download when no valid cm.exe #12
Description
When some Visual Studio Code extensions such as the C# or Java ones cannot detect the additional software they need (such as a valid MSBuild or Java JDK setups), they show an error dialog.
These error dialogs have buttons that open a web browser with the page where the user can download the missing toolchain.
Implement this for the Plastic SCM extension.
The button should lead to https://plasticscm.com/download when there is no valid cm.exe in the PATH.
Additionally, it would be extremely nice to be able to force a given cm through configuration file (for example, because we installed Plastic SCM using the ZIP installers, so the client directory is not in the user's PATH) - this dialog should have another button that leads directly to said configuration file / key.