Use C++20 `using enum` instead of alias enum members manually

Source/misdat.cpp

@@ -17,13 +17,7 @@
 namespace devilution {
 
 namespace {
-constexpr auto Physical = MissileDataFlags::Physical;
-constexpr auto Fire = MissileDataFlags::Fire;
-constexpr auto Lightning = MissileDataFlags::Lightning;
-constexpr auto Magic = MissileDataFlags::Magic;
-constexpr auto Acid = MissileDataFlags::Acid;
-constexpr auto Arrow = MissileDataFlags::Arrow;
-constexpr auto Invisible = MissileDataFlags::Invisible;
+using enum MissileDataFlags;
 } // namespace
 
 /** Data related to each missile ID. */

Source/objdat.cpp

@@ -159,12 +159,7 @@ const _object_id ObjTypeConv[] = {
 };
 
 namespace {
-constexpr auto Animated = ObjectDataFlags::Animated;
-constexpr auto Solid = ObjectDataFlags::Solid;
-constexpr auto MissilesPassThrough = ObjectDataFlags::MissilesPassThrough;
-constexpr auto Light = ObjectDataFlags::Light;
-constexpr auto Trap = ObjectDataFlags::Trap;
-constexpr auto Breakable = ObjectDataFlags::Breakable;
+using enum ObjectDataFlags;
 } // namespace
 
 /** Contains the data related to each object ID. */

Source/spelldat.cpp

@@ -9,11 +9,7 @@
 namespace devilution {
 
 namespace {
-const auto Fire = SpellDataFlags::Fire;
-const auto Lightning = SpellDataFlags::Lightning;
-const auto Magic = SpellDataFlags::Magic;
-const auto Targeted = SpellDataFlags::Targeted;
-const auto AllowedInTown = SpellDataFlags::AllowedInTown;
+using enum SpellDataFlags;
 } // namespace
 
 /** Data related to each spell ID. */