Fixed warnings and string serializer.

src/Murder.Editor/CustomFields/StringField.cs

@@ -14,7 +14,24 @@ internal class StringField : CustomField
         public override (bool modified, object? result) ProcessInput(EditorMember member, object? fieldValue)
         {
             bool modified = false;
-            string text = fieldValue as string ?? string.Empty;
+            string? text = fieldValue as string;
+
+            if (text is null)
+            {
+                string buttonText = "Create Default";
+                if (AttributeExtensions.TryGetAttribute(member, out DefaultAttribute? defaultAttribute))
+                {
+                    buttonText = defaultAttribute.Text;
+                }
+
+                if (ImGui.Button(buttonText))
+                {
+                    modified = true;
+                    text = string.Empty;
+                }
+
+                return (modified, text);
+            }
 
             if (AttributeExtensions.IsDefined(member, typeof(AtlasCoordinatesAttribute)))
             {

src/Murder/Components/Interactions/InteractOnCollisionComponent.cs

@@ -1,6 +1,7 @@
 using Bang.Components;
 using Bang.Interactions;
 using Murder.Attributes;
+using Murder.Utilities.Attributes;
 using System.Collections.Immutable;
 
 namespace Murder.Components

src/Murder/Core/Grid/GridConfiguration.cs

@@ -60,7 +60,7 @@ public GridConfiguration(int cellSize)
         public int FloorToGrid(float value) => value % CellSize == 0 ? Calculator.RoundToInt(value / CellSize) : Calculator.FloorToInt(value / CellSize);
 
         /// <summary>
-        /// Find in which cell of the grid a value would land, with default <see cref="Calculator.RoundToInt"/> behavior.
+        /// Find in which cell of the grid a value would land, with default <see cref="Calculator.RoundToInt(float)"/> behavior.
         /// </summary>
         /// <param name="value">The point in the grid</param>
         /// <returns>The cell this would land at.</returns>

src/Murder/Core/Particles/ParticleSystemTracker.cs

@@ -53,7 +53,6 @@ public ParticleSystemTracker(Emitter emitter, Particle particle, int seed = 0)
         /// <summary>
         /// Makes a "step" throughout the particle system.
         /// </summary>
-        /// <param name="dt">Delta time.</param>
         /// <param name="allowSpawn">Whether spawning new entities is allowed, e.g. the entity is not deactivated.</param>
         /// <param name="emitterPosition">Emitter position in game where the particles are fired from.</param>
         /// <returns>Returns whether the emitter is still running.</returns>