Fix incorrect CellInventory field types

[NotMyWing]

Fixes additional data losses not covered in #327. Enables natural support for larger cells and prevents them from overflowing past the int limit. Cells with int tags seamlessly migrate to long without regression.

The only minor concern is the change in signature for BasicCellInventory#loadCellItem(NBTTagCompound, int), which now accepts longs instead. This is not being overridden by mainstream mods such as EC2 or Thaumic Energistics, however.

Mostly on par with GTNewHorizons#234, except for native larger cells.

[serenibyss]

This seems like a good start, though I'm sure there'll be more places to address in the future. What about

Applied-Energistics-2/src/main/java/appeng/me/storage/BasicCellInventory.java

Line 176 in 0709d2d

final long size = Math.min(Integer.MAX_VALUE, request.getStackSize());

?

[NotMyWing]

This is most likely a safeguard for int-sized item/fluid stacks.