Fix concurrency issue when registering assets in AssetPipeline #141
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fixes #66
Because HTTP server can accept multiple requests at the same time we can end up iterating assets concurrently and causing
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.and it's probably also possible to create invalid state (duplicates).Switching to
ConcurrentDictionarywhich protects from concurrent writes and also adds indexer to get route directly.