Squash commits

Add: Check server status before running a task, wait until available

Opt: Add request headers and calm the users

Fix: Config won't update after server recovered

Update argument.yaml

Revert inappropriate changes and make code more pretty

Fix: Check server after get_next_task

Fix: KeyError when Alas restarts after recovery

Fix: fix bug and optimize code; Add: EN support

Fix typo; Optimize API calls

Opt: Further reduce API calls

Opt: Use random UA

module/config/argument/argument.yaml

@@ -24,6 +24,9 @@ Emulator:
   PackageName:
     value: auto
     option: [auto, ]
+  ServerPlatform:
+    value: disabled
+    option: [disabled, cn_android, cn_ios, cn_channel, en, en_channel]
   ScreenshotMethod:
     value: ADB
     option: [ADB, ADB_nc, uiautomator2, aScreenCap, aScreenCap_nc]