message: Make `vimrc.enable` default to false
  I'd thought we'd done this before, but turns out we only changed it in configuration.ts. This should definitely be opt-in, especially when the feature could still use a bit of polish.
diff: "vim.vimrc.enable": {
  "type": "boolean",
  "description": "Use key mappings from a .vimrc file.",
  - "default": "true"
  + "default": "false"
  },
  "vim.vimrc.path": {
  "type": "string",
  