libapprun_hooks cache folder support

[taozuhong]

I'v tried to use the tool to build the AppImage, found that failed at downloading the libapprun_hooks file every time:

Could make the app use the cache folder to avoid this issue? like download it manually, then try to load files from local cache folder while downloading failed.

INFO:root:Downloading: https://github.com/AppImageCrafters/AppRun/releases/download/v2.0.0/libapprun_hooks-Release-x86_64.so