other. Ensure headers in include/ can be included in any order
(except for econfig-spec.h, which is special). New header types.h to
help avoid inclusion cycles. Sort include directives. Remove some
superflous includes.
oprange, show_mission, nameofitem, build_mission_list_type,
unit_map, xdvisible, trdswitchown, ontradingblock, trad, check_trade,
unit_type_name, start_stop_unit, scut, scra, mission, multifire,
perform_mission, fuel, NSC_GENITEM): Replace struct genitem with
struct empobj. Remove genitem.h and create a new file empobj.h.
Replace multiple instances of unions of ef_type structures with
one standard union empobj_storage which is a superset of the individual
instances.
player->owner is no longer used. Use it to indicate that owner can be
accessed through struct genitem, similar to EFF_XY and EFF_GROUP.
(xdump): Fix ownership checking. Old version worked only when
nxtitem() set player->owner.
(empfile): Set EFF_OWNER for EF_LOST. This fixes `xdump lost'
disclosing other countries' losses.
(loststr): Document implications of EFF_OWNER.
(empfile): Set EFF_OWNER for EF_NATION.
(natstr): Rearrange members for EFF_OWNER, document.
(nat_ca): Unused so far. Clean it up, add most missing selectors.
(fileinit): Use it. This implements `xdump nation'.
(fileinit): Simplify setting map file size.
