Fix memory leaks

After adding sanitizers, memory leaks were detected when running GridGeneratorTests. This merge fixes them.

There are some leaks remaining in VirtualFluids_GPUTests . See #94 (closed).

This merge includes a temporary fix for #85.

src/gpu/GridGenerator/geometries/Conglomerate/Conglomerate.h

@@ -33,6 +33,8 @@
 #ifndef CONGLOMERATE_H
 #define CONGLOMERATE_H
 
+#include <array>
+
 #include "global.h"
 
 #include "geometries/Object.h"