Improve the performance of inventory updates

[DevNatan]

The inventory update happens without any conditions. This causes inventories that update constantly to have a "poor performance" (not noticeable for anyone who uses it, but notable for me who develops the library).

My goal is for there to be a way of detecting update and for it to happen intelligently, which, for example, ignores updating of static items – without a explicit rendering function, like constructor defined items via slot(n, ItemStack).