Add support for compiling and running engine without C# scripting

(configurable via `EngineConfiguration.UseCSharp` in Flax.Build)

Source/Engine/Level/Actors/Spline.cpp

@@ -4,7 +4,9 @@
 #include "Engine/Serialization/Serialization.h"
 #include "Engine/Animations/CurveSerialization.h"
 #include "Engine/Core/Math/Matrix.h"
+#if USE_MONO
 #include <ThirdParty/mono-2.0/mono/metadata/object.h>
+#endif
 
 Spline::Spline(const SpawnParams& params)
     : Actor(params)
@@ -437,6 +439,8 @@ void Spline::UpdateSpline()
     SplineUpdated();
 }
 
+#if !COMPILE_WITHOUT_CSHARP
+
 void Spline::GetKeyframes(MonoArray* data)
 {
     Platform::MemoryCopy(mono_array_addr_with_size(data, sizeof(Keyframe), 0), Curve.GetKeyframes().Get(), sizeof(Keyframe) * Curve.GetKeyframes().Count());
@@ -450,6 +454,8 @@ void Spline::SetKeyframes(MonoArray* data)
     UpdateSpline();
 }
 
+#endif
+
 #if USE_EDITOR
 
 #include "Engine/Debug/DebugDraw.h"

Source/Engine/Level/Actors/Spline.h

@@ -368,8 +368,10 @@ protected:
 private:
 
     // Internal bindings
+#if !COMPILE_WITHOUT_CSHARP
     API_FUNCTION(NoProxy) void GetKeyframes(MonoArray* data);
     API_FUNCTION(NoProxy) void SetKeyframes(MonoArray* data);
+#endif
 
 public: