Fix quotation and handling of additional streamlink options (#2495)

src/util/SplitCommand.hpp

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <QStringList>
+#include <QStringView>
+
+namespace chatterino {
+
+// Splits the string command into a list of tokens, and returns the list.
+// Tokens with spaces can be surrounded by double quotes;
+// three consecutive double quotes represent the quote character itself.
+//
+// Backported from QProcess 5.15
+QStringList splitCommand(QStringView command);
+
+}  // namespace chatterino