add THROW_STR enchantment

doc/MAGIC.md

@@ -903,6 +903,7 @@ Character status value  | Description
 `STRENGTH`              | Affects the strength stat. Formula for all stat affecting enchantments are `(base_stat + enchantment_addition) * (enchantment_multiplier + 1)`. Str 8 with enchantment `add 2, multiply 1` result in `(8+2) * (1+1) = 10 * 2 =` 20 str
 `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
 `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/character.cpp

@@ -5997,7 +5997,8 @@ int Character::throw_range( const item &it ) const
         tmp.charges = 1;
     }
 
-    int str = get_arm_str();
+    int ench_bonus = enchantment_cache->get_value_add( enchant_vals::mod::THROW_STR );
+    int str = get_arm_str() + ench_bonus;
 
     /** @ARM_STR determines maximum weight that can be thrown */
     if( ( tmp.weight() / 113_gram ) > str * 15 )  {
@@ -6019,12 +6020,10 @@ int Character::throw_range( const item &it ) const
     if( ret < 1 ) {
         return 1;
     }
-    // Cap at double our strength + skill
-    /** @EFFECT_STR caps throwing range */
 
-    /** @EFFECT_THROW caps throwing range */
-    if( ret > round( str * 3 + get_skill_level( skill_throw ) ) ) {
-        return round( str * 3 + get_skill_level( skill_throw ) );
+    // Cap at triple of our strength + skill
+    if( ret > round( str * 3 + get_skill_level( skill_throw ) + ench_bonus ) ) {
+        return round( str * 3 + get_skill_level( skill_throw ) + ench_bonus );
     }
 
     return ret;

src/magic_enchantment.cpp

@@ -193,6 +193,7 @@ namespace io
             case enchant_vals::mod::VOMIT_MUL: return "VOMIT_MUL";
             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::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

@@ -170,6 +170,7 @@ enum class mod : int {
     VOMIT_MUL,
     SCENT_MASK,
     CONSUME_TIME_MOD,
+    THROW_STR,
     SWEAT_MULTIPLIER,
     STAMINA_REGEN_MOD,
     MOVEMENT_EXERTION_MODIFIER,