Fix a few warnings

src/graphics/Renderer.cpp

@@ -847,7 +847,7 @@ void Renderer::draw_grav()
 		{
 			continue;
 		}
-		auto np = Vec2<float>(p.X * CELL, p.Y * CELL);
+		auto np = Vec2{ float(p.X * CELL), float(p.Y * CELL) };
 		auto dist = agx + agy;
 		for (auto i = 0; i < 4; ++i)
 		{

src/gui/interface/ScrollPanel.cpp

@@ -81,7 +81,7 @@ void ScrollPanel::XOnMouseDown(int x, int y, unsigned int button)
 			scrollbarSelected = true;
 			scrollbarInitialYOffset = int(offsetY);
 		}
-		initialOffsetY = offsetY;
+		initialOffsetY = int(offsetY);
 		scrollbarInitialYClick = y - Position.Y;
 		scrollbarClickLocation = 100;
 	}

src/simulation/gravity/Fft.cpp

@@ -179,7 +179,7 @@ void GravityImpl::Init()
 	fftwf_execute(kernelYForward.get());
 
 	//clear padded gravmap
-	std::memset(massBig.get(), 0.f, blocks.X * blocks.Y * sizeof(float));
+	std::fill(massBig.get(), massBig.get() + blocks.X * blocks.Y, 0.f);
 
 	thr = std::thread([this]() {
 		while (true)