C#: Assume 64-bit types when type has no meta

When the C# bindings generator finds a type without meta assume the type
refers to the 64-bit version of the type:
- `float` is converted to `double`
- `int` is converted to `long`

modules/mono/editor/script_templates/CharacterBody3D/basic_movement.cs

@@ -11,17 +11,17 @@ public partial class _CLASS_ : _BASE_
     // Get the gravity from the project settings to be synced with RigidBody nodes.
     public float gravity = ProjectSettings.GetSetting("physics/3d/default_gravity").AsSingle();
 
-    public override void _PhysicsProcess(float delta)
+    public override void _PhysicsProcess(double delta)
     {
         Vector3 velocity = Velocity;
 
         // Add the gravity.
         if (!IsOnFloor())
-            velocity.y -= gravity * delta;
+            velocity.y -= gravity * (float)delta;
 
         // Handle Jump.
         if (Input.IsActionJustPressed("ui_accept") && IsOnFloor())
-             velocity.y = JumpVelocity;
+            velocity.y = JumpVelocity;
 
         // Get the input direction and handle the movement/deceleration.
         // As good practice, you should replace UI actions with custom gameplay actions.