EEGVisEnabled check issue and webpack cache (#9159)

- Fix a WebpackMissingModule error with the EEGBrowser when EEGVisEnabled is set to "1" | "0" instead of "true" | "false".
- Set webpack to cache to the filesystem instead of memory. The caching to memory in dev mode of webpack was causing memory issues for machines with less than 2gb of ram.

npm-postinstall.js

@@ -88,7 +88,7 @@ getConfig.stdout.on('data', (data) => {
     );
   }
 
-  if (EEGVisEnabled === 'true') {
+  if (EEGVisEnabled === 'true' || EEGVisEnabled === '1') {
     console.info('\n ----- \n >> '
       + 'EEG Browser visualization components enabled '
       + '\n -----'

webpack.config.js

@@ -90,7 +90,7 @@ modulePlugins.push(
   })
 );
 
-if (EEGVisEnabled !== 'true') {
+if (EEGVisEnabled !== 'true' && EEGVisEnabled !== '1' ) {
   modulePlugins.push(
     new IgnorePlugin({
       resourceRegExp: /react-series-data-viewer/,
@@ -235,6 +235,7 @@ let config = [
     resolve: resolve,
     module: mod,
     stats: 'errors-warnings',
+    cache: {type: 'filesystem'},
   },
 ];