Merge https://github.com/coelckers/gzdoom

# Conflicts:
#	src/r_things.cpp

src/swrenderer/things/r_sprite.cpp

@@ -157,6 +157,7 @@ namespace swrenderer
 
 		// store information in a vissprite
 		RenderSprite *vis = RenderMemory::NewObject<RenderSprite>();
+		memset(vis, 0, sizeof(*vis));
 
 		vis->CurrentPortalUniq = renderportal->CurrentPortalUniq;
 		vis->xscale = FLOAT2FIXED(xscale);