Make vector<bool> work again (microsoft#703)

Add multi-threaded collections (microsoft#692)

Fix build

Fix concat_hstring for 0-length string (microsoft#675)

Fix concat_hstring for 0-length string (microsoft#675)

Resuming neutral context from STA should force background thread (mic…

…rosoft#662)

build

winui dispatcher (microsoft#648)

Simply when_all implementation and test (microsoft#647)

Revert utf-8 encoding of runtime class names (microsoft#621)