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Patric Stout

Feature: framework to make savegames self-descriptive

We won't be able to make it fully self-descriptive (looking at you
MAP-chunks), but anything else can. With this framework, we can
add headers for each chunk explaining how each chunk looks like
in detail.

They also will all be tables, making it a lot easier to read in
external tooling, and opening the way to consider a database
(like SQLite) to use as savegame format.

Lastly, with the headers in the savegame, you can freely add
fields without needing a savegame version bump; older versions
of OpenTTD will simply ignore the new field. This also means
we can remove all the SLE_CONDNULL, as they are irrelevant.

The next few commits will start using this framework.

add_files(
    afterload.cpp
    ai_sl.cpp
    airport_sl.cpp
    animated_tile_sl.cpp
    autoreplace_sl.cpp
    cargomonitor_sl.cpp
    cargopacket_sl.cpp
    cheat_sl.cpp
    company_sl.cpp
    depot_sl.cpp
    economy_sl.cpp
    engine_sl.cpp
    game_sl.cpp
    gamelog_sl.cpp
    goal_sl.cpp
    group_sl.cpp
    industry_sl.cpp
    labelmaps_sl.cpp
    linkgraph_sl.cpp
    map_sl.cpp
    misc_sl.cpp
    newgrf_sl.cpp
    newgrf_sl.h
    object_sl.cpp
    oldloader.cpp
    oldloader.h
    oldloader_sl.cpp
    order_sl.cpp
    saveload.cpp
    saveload.h
    saveload_filter.h
    saveload_internal.h
    signs_sl.cpp
    station_sl.cpp
    storage_sl.cpp
    strings_sl.cpp
    story_sl.cpp
    subsidy_sl.cpp
    town_sl.cpp
    vehicle_sl.cpp
    waypoint_sl.cpp
)