Android: Apply weights to boxes as well as items. We have to update the weights whenever we add or remove something from a box that has already been packed, so adding a private boxUpdate method for doing that. I tried to clean up the existing code somewhat in the process but it caused other layout problems... so I went bare bones with the changes here and it seems to work. Will revisit the streamlining later.

#include "winuser.h"
#ifdef DW64
1 RT_MANIFEST dwtest.exe.x64.manifest
#else
1 RT_MANIFEST dwtest.exe.x86.manifest
#endif