Removed templatization of serializer_block_write function, removed coroutinized block_write from serializer_t interface.
Removed unused coroutinized serializer_t subclass block_write calls.
Added serializer_t::block_writes with default implementation.
Added comment about serializer_t::block_writes.
Implemented log_serializer_t::block_writes, removed block_write_info_t, moved buf_write_info_t to serializer/types.hpp.
Made semantic_checking_serializer_t::block_writes be implemented.
Implemented translator_serializer_t::block_writes.
Removed default implementation of serializer_t::block_writes.