Add vscode path to tsconfig

Workaround for TypeScript duplicate identifier errors when using npm link/lerna
More info: microsoft/TypeScript#6496
Root cause: microsoft/vscode-extension-vscode#90
Discussion: https://stackoverflow.com/questions/48221762/error-compiling-vs-code-extension-with-dependency-on-another-extension

Author: guw

packages/salesforcedx-vscode-apex-debugger/tsconfig.json

@@ -13,7 +13,13 @@
     "rootDir": ".",
     "outDir": "out",
     "preserveConstEnums": true,
-    "strict": true
+    "strict": true,
+    "baseUrl": "",
+    "paths": {
+      "vscode": [
+        "node_modules/vscode"
+      ]
+    }
   },
   "exclude": [
     "node_modules",