Issues Fixed

Fixes #7281

Implemented Solution

• Copy vanilla/forgecaps compoundtags before adding them to the cloneitemstack. With ctrl+pick block, they end up in the BlockEntityTag that gets tacked onto the itemstack's tag. Which was vanillaTag and so vanillaTag now contained a reference to itself. This is all that's strictly necessary to fix the linked issue.
• Copy the tags on placement too so every backtank placed from the same stack has its own copy instead of sharing the tags.
• And throw out BlockEntityTag so it can't repeatedly nest and cause the same issue but then via recursion depth. It didn't meaningfully retain anything in that tag that wasn't in vanillaTag/forgeCaps anyhow when placed.