Launch VS Code with `--disable-gpu` flag by default

VSCode 1.40 (Oct. 2019) now has the solution I was looking for!

Disable GPU acceleration

We have heard issue reports from users that seem related to how the GPU is used to render VS Code's UI.
These users have a much better experience when running VS Code with the additional --disable-gpu command-line argument.
Running with this argument will disable the GPU hardware acceleration and fall back to a software renderer.

To make life easier, you can add this flag as a setting so that it does not have to be passed on the command line each time.

To add this flag:

• Open the Command Palette (Ctrl+Shift+P).
• Run the Preferences: Configure Runtime Arguments command. This command will open an argv.json file to configure runtime arguments.
  You might see some default arguments there already.
• Add "disable-hardware-acceleration": true.
• Restart VS Code.

Note: Do not use this setting unless you are seeing issues!