(xunsymbol1): Use ef_elt_byname().
(setsym): Accept any table reference, not just to symbol table.
(symval): New.
(setsym, add2symset): Use it.
(mtsymset): Last remaining user of getsymtab(); inline and simplify.
(getsymtab): Remove.
(xunsymbol1, xunsymbol): Rename.
(ef_elt_byname): New.
(nstr_match_val): Use it to generalize to arbitrary table with
uniquely named elements. Use ca_type to find table, remove parameter
type. Callers changed.
(nstr_mkselval): Adapt sanity check accordingly.
(NSC_TYPEID): No longer needed, remove, users changed to use
appropriate integer type instead. This fixes signedness of sector
selectors des and newdes.
(meta_type): Remove entry for NSC_TYPEID.
(nstr_coerce_val): Can't detect typeid - integer mismatch anymore.
Was nice to have; perhaps revive it later.
(launch_sat, scra, scut, scuttle_ship, scuttle_land, knockdown)
(ac_planedamage, detonate, attack_val, defense_val, air_damage)
(msl_intercept, msl_launch_mindam, pln_prewrite, shp_prewrite):
Simplify unit destruction: just zero efficiency, leave makelost()
etc. to the prewrite callback.
regardless of the option, but forced to sct_effic when disabled. This
screws up sct_defense when you disable DEFENSE_INFRA. Implement it
more like FALLOUT: use sct_defense if enabled, else sct_effic. The
change should be invisible except in xdump, which shows the real
sct_defense. Closes#804641.
(SCT_DEFENSE): New.
(dump, sinfra, sector_strength): Use it.
(eff_bomb, build_bridge, build_tower, new, buildeff, sect_damage)
(put_combat, checksect, produce_sect): Don't force sct_defense to
sct_effic when DEFENSE_INFRA is disabled.
(meta_type): Add its entry.
(setnum, nstr_promote, nstr_exec_val): Deal with it. nstr_exec_val()
implements opt_HIDDEN by mapping unknown values to -1.
(natstr, nat_ca): Use it for member nat_relate. This also halves its
size. Fixes very minor leak: before, player could see relations to
all countries, regardless of contact.
(nation_relations): Add entry for -1.
(nati, populace): Use it.
(populace, nati): Change hap, pct from float to double, because they
are used as double.
(nati): Print happiness needed with just two decimals, like the other
levels.
(nukstr): Hold one nuke instead of a stockpile: replace members nuk_n,
nuk_types by nuk_type, nuk_plane. Add nuk_land for completeness, like
nuk_ship it's not yet used.
(nuke_ca): Update accordingly: replace selectors number and types by
type and plane.
(build_nuke): Update accordingly.
(ndump, nuke): Update accordingly. Output is no longer sorted by
location, and nukes in same location no longer share id. nuke's extra
columns for nuclear plants are repeated for every nuke.
(trade_desc): Update accordingly.
(cede, grab_sect, check_nuke_ok, detonate, trade_nameof): Talk about
nukes instead of nuclear stockpiles.
(arm, disarm): Rewrite, split off new disarm(). Don't remove nuke
from the nuke file on arm. Allow usual plane syntax, not just plane
number. Change second argument from nuke type to nuke number. When
plane is already armed, ignore nuke argument and rearm (broken in
4.2.6).
(tran_nuke): Update for changed struct nukstr, make as similar as
possible to tran_plane. Change syntax to match transport plane.
(player_coms): Update arm, disarm and transport accordingly.
(prnuke, nuk_on_plane): New.
(nuk_add, nuk_delete): Stockpile management, remove.
Checking the real sector leaks information, which can be abused to
test whether an arbitrary sector is unfriendly or an inefficient
harbor or bridge, at the cost of some ship mobility (I think).
Initially broken ca. 1993, went through several changes, but the leak
survived them all.
snxtsct_area(). Callers march() and navi() clearly don't want it to
use conditionals. navi() used to zap them (just removed). march()
doesn't, which was a bug similar to #785447. It's less clear for
caller map(). I'd argue that conditionals apply to map's argument,
the unit number, not to the map itself. draw_map() zaps them anyway.
