Add spawning support to the world component

sources/Gameplay/BaseClasses/Frontend/World/AWorldComponent.uc

@@ -71,6 +71,25 @@ public function TracingIterator TracePlayerSight(EPlayer player);
  */
 public function TracingIterator TraceSight(EPawn pawn);
 
+//  TODO: Add `CanSpawnExplain()` method
+/**
+ *  Spawns a new `EPlaceable` based on the given `template` at a given location
+ *  `location`, facing it into the given direction `direction`.
+ *
+ *  @param  template    Describes entity (supporting `EPlaceable` interface) to
+ *      spawn into the world.
+ *  @param  location    At what location to spawn that entity.
+ *  @param  direction   In what direction spawned entity must face.
+ *  @return `EPlaceable` interface for the spawned entity. `none` if spawning it
+ *      has failed. If method returns interface to a non-existent entity, it
+ *      means that entity has successfully spawned, but then something handled
+ *      its spawning and destroyed it.
+ */
+public function EPlaceable Spawn(
+    BaseText            template,
+    optional Vector     location,
+    optional Rotator    direction);
+
 defaultproperties
 {
 }

sources/Gameplay/BaseClasses/Frontend/World/TracingIterator.uc

@@ -36,17 +36,7 @@ public function AcediaObject Get() { return none; }
  *      currently at. Origin vector (with all coordinates set to `0.0`) if
  *      iteration has already finished.
  */
-public function Vector GetHitLocation()
-{
-    if (!initialized) {
-        return Vect(0.0f, 0.0f, 0.0f);
-    }
-    TryTracing();
-    if (HasFinished()) {
-        return Vect(0.0f, 0.0f, 0.0f);
-    }
-    return hitLocations[currentIndex];
-}
+public function Vector GetHitLocation();
 
 /**
  *  Returns hit normal for the `EPlaceable` that `TracingIterator` is
@@ -56,17 +46,7 @@ public function Vector GetHitLocation()
  *      currently at. Origin vector (with all coordinates set to `0.0`) if
  *      iteration has already finished.
  */
-public function Vector GetHitNormal()
-{
-    if (!initialized) {
-        return Vect(0.0f, 0.0f, 0.0f);
-    }
-    TryTracing();
-    if (HasFinished()) {
-        return Vect(0.0f, 0.0f, 0.0f);
-    }
-    return hitNormals[currentIndex];
-}
+public function Vector GetHitNormal();
 
 /**
  *  Returns `EPlaceable` caller `TracingIterator` is currently at.
@@ -77,11 +57,7 @@ public function Vector GetHitNormal()
  *
  *  @return `EPlaceable` caller `TracingIterator` is currently at.
  */
-public function EPlaceable GetPlaceable()
-{
-    //  We only create `EPlaceable` child classes in this class
-    return EPlaceable(Get());
-}
+public function EPlaceable GetPlaceable();
 
 /**
  *  Returns `EPlaceable` caller `TracingIterator` is currently at as `EPawn`,

sources/Gameplay/KF1Frontend/World/KF1_WorldComponent.uc

@@ -84,6 +84,32 @@ public function TracingIterator TraceSight(EPawn pawn)
     return TraceBetween(start, end);
 }
 
+public function EPlaceable Spawn(
+    BaseText            template,
+    optional Vector     location,
+    optional Rotator    direction)
+{
+    local Actor             result;
+    local Pawn              resultPawn;
+    local class<Actor>      actorClass;
+    local ServerLevelCore   core;
+
+    actorClass = class<Actor>(_.memory.LoadClass(template));
+    if (actorClass == none) {
+        return none;
+    }
+    core = ServerLevelCore(class'ServerLevelCore'.static.GetInstance());
+    result = core.Spawn(actorClass,,, location, direction);
+    if (result == none) {
+        return none;
+    }
+    resultPawn = Pawn(result);
+    if (resultPawn != none) {
+        return class'EKFPawn'.static.Wrap(resultPawn);
+    }
+    return class'EKFUnknownPlaceable'.static.Wrap(resultPawn);
+}
+
 defaultproperties
 {
     tracingDistance = 10000