Core - Added node provider plugin feature type

Visual Scripting - Removed all nodes

src/Artemis.Storage/Entities/Profile/Nodes/NodeEntity.cs

@@ -15,7 +15,7 @@ public class NodeEntity
     {
         Id = nodeEntity.Id;
         Type = nodeEntity.Type;
-        PluginId = nodeEntity.PluginId;
+        ProviderId = nodeEntity.ProviderId;
 
         Name = nodeEntity.Name;
         Description = nodeEntity.Description;
@@ -29,7 +29,7 @@ public class NodeEntity
 
     public Guid Id { get; set; }
     public string Type { get; set; }
-    public Guid PluginId { get; set; }
+    public string ProviderId { get; set; }
 
     public string Name { get; set; }
     public string Description { get; set; }

src/Artemis.Storage/Migrations/M0021GradientNodes.cs

@@ -22,7 +22,7 @@ public class M0021GradientNodes : IStorageMigration
         {
             Id = Guid.NewGuid(),
             Type = "ColorGradientNode",
-            PluginId = Guid.Parse("ffffffff-ffff-ffff-ffff-ffffffffffff"),
+            ProviderId = "Artemis.Plugins.Nodes.General.GeneralNodesProvider-d9e1ee78",
             Name = "Color Gradient",
             Description = "Outputs a color gradient with the given colors",
             X = exitNode.X,

src/Artemis.Storage/Repositories/PluginRepository.cs

@@ -29,7 +29,6 @@ internal class PluginRepository : IPluginRepository
     public void SavePlugin(PluginEntity pluginEntity)
     {
         _repository.Upsert(pluginEntity);
-        _repository.Database.Checkpoint();
     }
 
     public void AddSetting(PluginSettingEntity pluginSettingEntity)