Fix model downloader crash on shutdown #155
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Otherwise this is only deleted when OBS exits, effectively leaking memory
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download_threadanddownload_workerare automatically being deleted when they were finished, leaving dangling pointers; accessing those pointers from the destructor ofModelDownloadercauses OBS to crash for me on shutdown (or alternatively hang on shutdown with no visible windows)Additionally,
ModelDownloaderwas only being deleted at shutdown; with this it's instead deleted after it's closed