add 'step-height' entity property

src/objects/EntityDef.hpp

@@ -42,6 +42,9 @@ struct EntityDef {
     /// @brief Does entity prevent blocks setup
     bool blocking = true;
 
+    /// @brief Max obstacle height that does not require jumping
+    float stepHeight = 0.5f;
+
     /// @brief save-** flags
     struct {
         bool enabled = true;

src/objects/Rigidbody.cpp

@@ -80,4 +80,5 @@ void Rigidbody::initialize(
             create_sensor_callback<scripting::on_sensor_enter>(entities),
             create_sensor_callback<scripting::on_sensor_exit>(entities)};
     }
+    hitbox.stepHeight = def.stepHeight;
 }