AutoStory: story step types and engine (split from #122, layer 1 of 3) - #312

<file>: file_lines=840 (advisory above 500, limit 1000)

PokemonAutomation::Pokemon::run_segment( RunState & state , Segment & segment , const SegmentRange & range , const SegmentPolicy & policy , SegmentHooks & hooks): function_lines=26 (advisory above 25, limit 50)

PokemonAutomation::Pokemon::run_row( RunState & state , const Segment & segment , CheckpointSpec & spec , const SegmentPolicy & policy , SegmentHooks & hooks , SegmentReport & report , CheckpointRun & run): function_lines=40 (advisory above 25, limit 50)

<file>: file_lines=562 (advisory above 500, limit 1000)

PokemonAutomation::Pokemon::check_shared_file( const std :: string & filename): function_lines=28 (advisory above 25, limit 50)

PokemonAutomation::Pokemon::read_story_step( const JsonValue & value , std :: string_view source): function_lines=39 (advisory above 25, limit 50)

PokemonAutomation::Pokemon::story_step_json( const StoryStep & step): function_lines=45 (advisory above 25, limit 50)

PokemonAutomation::Pokemon::read_story_pose( const JsonValue & value , std :: string_view source): function_lines=31 (advisory above 25, limit 50)

PokemonAutomation::Pokemon::story_pose_json( const Pose & pose): function_lines=27 (advisory above 25, limit 50)

PokemonAutomation::ComputerPrograms::make_UNIT_TESTS_ALL(): function_lines=40 (advisory above 25, limit 50)