vscode: use CMake plugin for IntelliSense

.vscode/c_cpp_properties.json

@@ -45,8 +45,9 @@
                     "${workspaceFolder}"
                 ],
                 "limitSymbolsToIncludedHeaders": true
-            }
+            },
+            "configurationProvider": "ms-vscode.cmake-tools"
         }
     ],
     "version": 4
-}
+}