Patch console to append component stacks (#348)

* Patch console.warn and console.error to auto-append owners-only component stacks.

This setting is enabled by default and will work for React Native even if no front-end DevTools shell is being used. The setting can be disabled via a new, persisted user preference though.

shells/dev/src/devtools.js

@@ -8,7 +8,7 @@ import { installHook } from 'src/hook';
 import { initDevTools } from 'src/devtools';
 import Store from 'src/devtools/store';
 import DevTools from 'src/devtools/views/DevTools';
-import { getSavedComponentFilters } from 'src/utils';
+import { getSavedComponentFilters, getAppendComponentStack } from 'src/utils';
 
 const iframe = ((document.getElementById('target'): any): HTMLIFrameElement);
 
@@ -18,6 +18,7 @@ const { contentDocument, contentWindow } = iframe;
 // because they are stored in localStorage within the context of the extension.
 // Instead it relies on the extension to pass filters through.
 contentWindow.__REACT_DEVTOOLS_COMPONENT_FILTERS__ = getSavedComponentFilters();
+contentWindow.__REACT_DEVTOOLS_APPEND_COMPONENT_STACK__ = getAppendComponentStack();
 
 installHook(contentWindow);