Update WIP discord and some vendors.

CPR has features disabled and PCRE is fully disabled until updated to new code.

vendor/CPR/cpr/callback.cpp

@@ -0,0 +1,14 @@
+#include <cpr/callback.h>
+#include <curl/curl.h>
+#include <functional>
+
+namespace cpr {
+
+void CancellationCallback::SetProgressCallback(ProgressCallback& u_cb) {
+    user_cb.emplace(std::reference_wrapper{u_cb});
+}
+bool CancellationCallback::operator()(cpr_pf_arg_t dltotal, cpr_pf_arg_t dlnow, cpr_pf_arg_t ultotal, cpr_pf_arg_t ulnow) const {
+    const bool cont_operation{!cancellation_state->load()};
+    return user_cb ? (cont_operation && (*user_cb)(dltotal, dlnow, ultotal, ulnow)) : cont_operation;
+}
+} // namespace cpr