custom Electron flags support (fixes #754)

app/lib/app.ts

@@ -19,8 +19,12 @@ export class Application {
         }
 
         app.commandLine.appendSwitch('disable-http-cache')
-        app.commandLine.appendSwitch('force_discrete_gpu', '0')
         app.commandLine.appendSwitch('lang', 'EN')
+
+        for (const flag of configData.flags || [['force_discrete_gpu', '0']]) {
+            console.log('Setting Electron flag:', flag.join('='))
+            app.commandLine.appendSwitch(flag[0], flag[1])
+        }
     }
 
     init () {

terminus-core/src/configDefaults.yaml

@@ -12,3 +12,7 @@ appearance:
   vibrancyType: 'blur'
 enableAnalytics: true
 enableWelcomeTab: true
+electronFlags:
+  - ['disable-http-cache']
+  - ['force_discrete_gpu', '0']
+  - ['lang', 'EN']