[enhancement]: support clearing query and http cache (#475)

* [enhancement]: support clearing query and http cache

  - Adds the ability to invalidate all queries (useful for forcing refresh, and clearing lyrics which are cached forever)
  - [Desktop only] adds the ability to clear the Electron HTTP cache (e.g. cached images)

* use clearer language

* move cache settings to general

src/main/preload/browser.ts

@@ -24,7 +24,12 @@ const devtools = () => {
     ipcRenderer.send('window-dev-tools');
 };
 
+const clearCache = (): Promise<void> => {
+    return ipcRenderer.invoke('window-clear-cache');
+};
+
 export const browser = {
+    clearCache,
     devtools,
     exit,
     maximize,
@@ -32,3 +37,5 @@ export const browser = {
     quit,
     unmaximize,
 };
+
+export type Browser = typeof browser;