Add Trait "Deaf" (#29124)

* Added Trait Deaf

Adds the trait Deaf, making it impossible to hear.

data/json/mutations.json

@@ -736,7 +736,18 @@
         "starting_trait" : true,
         "category" : ["PLANT"],
         "cancels" : ["GOODHEARING"],
+        "changes_to" : ["DEAF"],
         "hearing_modifier" : 0.5
+    },{
+        "type" : "mutation",
+        "id" : "DEAF",
+        "name" : "Deaf",
+        "points" : -4,
+        "description" : "You're not able to hear anything, and as such you're not able to talk to NPCs.",
+        "starting_trait" : true,
+        "prereqs" : ["BADHEARING"],
+        "cancels" : ["GOODHEARING"],
+        "hearing_modifier" : 0
     },{
         "type" : "mutation",
         "id" : "SLOWLEARNER",

src/player.cpp

@@ -256,6 +256,7 @@ static const trait_id trait_COLDBLOOD2( "COLDBLOOD2" );
 static const trait_id trait_COLDBLOOD3( "COLDBLOOD3" );
 static const trait_id trait_COLDBLOOD4( "COLDBLOOD4" );
 static const trait_id trait_COMPOUND_EYES( "COMPOUND_EYES" );
+static const trait_id trait_DEAF( "DEAF" );
 static const trait_id trait_DEBUG_BIONIC_POWER( "DEBUG_BIONIC_POWER" );
 static const trait_id trait_DEBUG_CLOAK( "DEBUG_CLOAK" );
 static const trait_id trait_DEBUG_HS( "DEBUG_HS" );
@@ -12026,7 +12027,7 @@ void player::add_known_trap( const tripoint &pos, const trap &t )
 
 bool player::is_deaf() const
 {
-    return get_effect_int( effect_deaf ) > 2 || worn_with_flag( "DEAF" ) ||
+    return get_effect_int( effect_deaf ) > 2 || worn_with_flag( "DEAF" ) || has_trait( trait_DEAF ) ||
            ( has_active_bionic( bio_earplugs ) && !has_active_bionic( bio_ears ) ) ||
            ( has_trait( trait_M_SKIN3 ) && g->m.has_flag_ter_or_furn( "FUNGUS", pos() ) && in_sleep_state() );
 }