Player Inventory & Block Interactions

[MattIPv4]

Two requests if either are possible, the kinda go hand in hand.

Player inventory access and control. Only the player inventory so handling all different sizes etc isn't needed.

And then the ability to interact with blocks, place and break. Thus the player inventory control would be nice so you can select what item to use in the hotbar.

[ORelio]

Merging with #205