Fix vector+unique_ptr issues with MSVS 2019

Because a StreamState object contains a unique_ptr, it is not
copyable.  A vector of StreamStates, therefore, causes a compile error
on resize or push_back, both of which invoke the copy constructor.

I don't know why MSVS complains, but clang does not.

To fix this, I'm changing vector<StreamState> into deque<StreamState>.

At this point static_library builds are working in MSVS 2019.
shared_library builds are still not working.

Issue #867 (MSVS 2019)
Issue #336 (progress toward replacing Travis & Appveyor with GitHub
  Actions, which uses MSVS 2019)
b/190743862 (internal; tracking replacement of Travis)

Change-Id: Iaa9d5fc357102d15eac96c29ebeee7c7236e976b

packager/media/chunking/cue_alignment_handler.h

@@ -7,6 +7,7 @@
 #ifndef PACKAGER_MEDIA_CHUNKING_CUE_ALIGNMENT_HANDLER_
 #define PACKAGER_MEDIA_CHUNKING_CUE_ALIGNMENT_HANDLER_
 
+#include <deque>
 #include <list>
 
 #include "packager/media/base/media_handler.h"
@@ -73,7 +74,7 @@ class CueAlignmentHandler : public MediaHandler {
   Status RunThroughSamples(StreamState* stream);
 
   SyncPointQueue* const sync_points_ = nullptr;
-  std::vector<StreamState> stream_states_;
+  std::deque<StreamState> stream_states_;
 
   // A common hint used by all streams. When a new cue is given to all streams,
   // the hint will be updated. The hint will always be larger than any cue. The