Add RequestList so a request table can atomically request a set of items
Start of Request Table GUI work
Replace "Request" button with +/++/+++
Output slot is clicked while there's not enough space, put the (remainder of) the result stack on the cursor
Don't allow stacking items > maxStacksize in LCT and LRT inventories.
Make buffercounter work again (try every sink, +1, buffer, repeat 4 times, then pop)
Reset buffercounter whenever we take some from a item
Prevent clientside NPE here.