Workarounds for upstream electron issue

Due to an upstream issue with newer version of electron that was shipped with VS Code 1.26.0 recently, some users might see an SIGPIPE error instead of graceful error handling of the absence of certain Go tools. This release attempts to work around this issue by trying to catch such cases earlier and prompting the user to install the missing tool.

Upstream Issue in VS Code: microsoft/vscode#56301
Upstream Issue in Electron: electron/electron#13254 and electron/electron#13679