HP regen softcoding for Classic ruleset

data/classic/effects.ruleset

@@ -118,6 +118,34 @@ reqs    =
 type    = "Tech_Upkeep_Free"
 value   = 3
 
+; Basic HP regen.  Not for helis, as they have hp_loss_pct=10
+; All unit-types' hitpoints are divisible by 10, so no need to worry about rounding
+[effect_hp_regen_base]
+type    = "HP_Regen"
+value   = 10
+reqs    =
+    { "type", "name", "range", "present"
+      "UnitClass", "Helicopter", "Local", FALSE
+    }
+
+; When hardcoded, effect_hp_regen_base was applied after the HP_Regen_Min
+[effect_hp_regen_min_base]
+type    = "HP_Regen_Min"
+value   = 10
+reqs    =
+    { "type", "name", "range", "present"
+      "UnitClass", "Helicopter", "Local", FALSE
+    }
+
+; Units in cities regenerate at least 1/3 of their HP regardless
+[effect_hp_regen_min_city]
+type    = "HP_Regen_Min"
+value   = 34
+reqs    =
+    { "type", "name", "range"
+      "CityTile", "Center", "Local"
+    }
+
 ; Fortress HP regen
 [effect_fortress_hp_regen]
 type    = "HP_Regen"
@@ -136,6 +164,23 @@ reqs    =
       "Activity", "Fortified", "Local"
     }
 
+[effect_fortified_hp_regen]
+type    = "HP_Regen"
+value   = 10
+reqs    =
+    { "type", "name", "range"
+      "Activity", "Fortified", "Local"
+    }
+
+; When hardcoded, effect_fortified_hp_regen was applied after the HP_Regen_Min
+[effect_fortified_hp_regen_min]
+type    = "HP_Regen_Min"
+value   = 10
+reqs    =
+    { "type", "name", "range"
+      "Activity", "Fortified", "Local"
+    }
+
 [effect_city_fortified]
 type    = "Fortify_Defense_Bonus"
 value   = 50