Overhaul animation queues so the queue is stored as a single encoded string.

luprex/cpp/core/streambuffer.cpp

@@ -169,6 +169,15 @@ void StreamBuffer::read_bytes_into(char *data, int64_t size) {
     read_cursor_ += size;
 }
 
+std::string_view StreamBuffer::read_string_view_limit(uint64_t limit) {
+    uint64_t length = read_length();
+    if (length > limit) throw StreamCorruption();
+    check_available(length);
+    std::string_view result(read_cursor_, length);
+    read_cursor_ += length;
+    return result;
+}
+
 void StreamBuffer::write_xyz(const util::XYZ &xyz) {
     make_space(12);
     memcpy(write_cursor_, &xyz.x, 4);