This document describes the format of the replay files (*.p1r) used by SDLPoP.

* 3 bytes: magic number: "P1R"
* 2 byte: replay_format_class: always 0 for now.
* 1 byte: REPLAY_FORMAT_CURR_VERSION
* 1 byte: REPLAY_FORMAT_DEPRECATION_NUMBER
* 8 bytes: creation timestamp
* 1 byte: length of levelset_name
* n bytes: levelset_name
* 1 byte: length of implementation_name
* n bytes: implementation_name
* 4 bytes: savestate_size
* n bytes: savestate_buffer (see quick_process() for its contents)
* for each section of options: (see the replay_options_sections[] array)
	* 4 bytes: section_size
	* n bytes: section data (see the options_process_*() functions for their contents)
* 2 bytes: start_level
* 4 bytes: saved_random_seed
* 4 bytes: num_replay_ticks
* n bytes: moves (see replay_move_type)
