Make some existing errors warnings

We are enabling eslint for TypeScript files, which have not historically had this type of check.

Rather than trying to fix all these issues up front, we'll convert them to warnings and fix them in the future.

Hopefully we can reenable them soon.

.eslintrc

@@ -101,7 +101,7 @@
     "no-octal-escape": "error",
     "no-proto": "error",
     "no-redeclare": "error",
-    "no-shadow": "error",
+    "no-shadow": "warn",
     "no-spaced-func": "error",
     "no-this-before-super": "error",
     "no-throw-literal": "error",
@@ -112,7 +112,7 @@
     "no-unreachable": "error",
     "no-unused-expressions": "error",
     "@typescript-eslint/no-unused-vars": [
-      "error",
+      "warn",
       { "ignoreRestSiblings": true }
     ],
     "no-use-before-define": ["error", "nofunc"],
@@ -129,7 +129,7 @@
     "react/jsx-boolean-value": "error",
     "react/jsx-uses-react": "error",
     "react/jsx-uses-vars": "error",
-    "react/prefer-stateless-function": "error",
+    "react/prefer-stateless-function": "warn",
     "react/prefer-es6-class": "error",
     "react/jsx-pascal-case": "error",
     "react/require-render-return": "error",
@@ -147,7 +147,7 @@
     "import/no-extraneous-dependencies": "error",
     "import/no-named-as-default-member": "error",
     "import/no-unresolved": "error",
-    "import/order": "error",
+    "import/order": "warn",
     "no-constructor-bind/no-constructor-bind": "error"
   }
 }