Extension store base class + rename main/renderer-extensions -> extensions (#1107)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

src/common/base-store.ts

@@ -56,13 +56,17 @@ export class BaseStore<T = any> extends Singleton {
       ...confOptions,
       projectName: "lens",
       projectVersion: getAppVersion(),
-      cwd: (app || remote.app).getPath("userData"),
+      cwd: this.storePath(),
     });
     logger.info(`[STORE]: LOADED from ${this.storeConfig.path}`);
     this.fromStore(this.storeConfig.store);
     this.isLoaded = true;
   }
 
+  protected storePath() {
+    return (app || remote.app).getPath("userData")
+  }
+
   protected async saveToFile(model: T) {
     logger.info(`[STORE]: SAVING ${this.name}`);
     // todo: update when fixed https://github.com/sindresorhus/conf/issues/114