add THROW_DAMAGE enchantment

doc/MAGIC.md

@@ -904,6 +904,7 @@ Character status value  | Description
 `SWEAT_MULTIPLIER`      | Affects how much your body can sweat. Affects all bodyparts at once. Since it's a percent, using `multiply` is recommended.
 `THIRST`                | 
 `THROW_STR`             | Increases your strength for throwing purposes. Not limited by your throwing skill (you still throw it as precise as your skill allows you, just further). Only additive. Rule of thumb: one additional point of strength allow you to throw 113 g object 10 tiles further, or 1130 g object 1 tile further, limited by [ str * 3 + skill ]. Full calculations are in Character::throw_range
+`THROW_DAMAGE`          | Increases the damage of any thrown projectile. `add` adds this amount of damage to the projectile as bash damage, `multiply` would increase all projectile damage, not only bash type.
 `UGLINESS`              | Affects your `ugliness` stat, which affects NPCs' initial opinion of you.
 `VITAMIN_ABSORB_MOD`    | Increases amount of vitamins obtained from the food
 `VOMIT_MUL`             | Affects your chances to vomit.

src/magic_enchantment.cpp

@@ -194,6 +194,7 @@ namespace io
             case enchant_vals::mod::SCENT_MASK: return "SCENT_MASK";
             case enchant_vals::mod::CONSUME_TIME_MOD: return "CONSUME_TIME_MOD";
             case enchant_vals::mod::THROW_STR: return "THROW_STR";
+            case enchant_vals::mod::THROW_DAMAGE: return "THROW_DAMAGE";
             case enchant_vals::mod::SWEAT_MULTIPLIER: return "SWEAT_MULTIPLIER";
             case enchant_vals::mod::STAMINA_REGEN_MOD: return "STAMINA_REGEN_MOD";
             case enchant_vals::mod::MOVEMENT_EXERTION_MODIFIER: return "MOVEMENT_EXERTION_MODIFIER";

src/magic_enchantment.h

@@ -171,6 +171,7 @@ enum class mod : int {
     SCENT_MASK,
     CONSUME_TIME_MOD,
     THROW_STR,
+    THROW_DAMAGE,
     SWEAT_MULTIPLIER,
     STAMINA_REGEN_MOD,
     MOVEMENT_EXERTION_MODIFIER,

src/ranged.cpp

@@ -1374,6 +1374,9 @@ dealt_projectile_attack Character::throw_item( const tripoint &target, const ite
     impact.add_damage( damage_bash, std::min( weight / 100.0_gram,
                        static_cast<double>( thrown_item_adjusted_damage( thrown ) ) ) );
 
+    impact.add_damage( damage_bash,
+                       enchantment_cache->get_value_add( enchant_vals::mod::THROW_DAMAGE ) );
+    impact.mult_damage( 1 + enchantment_cache->get_value_multiply( enchant_vals::mod::THROW_DAMAGE ) );
     if( thrown.has_flag( flag_ACT_ON_RANGED_HIT ) ) {
         proj_effects.insert( ammo_effect_ACT_ON_RANGED_HIT );
         thrown.active = true;