New inventory/crafting screen, text popups

- F11 to enter fullscreen
- F2 to take a screenshot
- updatePlayer packet now sends health and score
- the three inventories (block/tile/item) were merged into one
- crafting recipes were also merged into one list (note that the crafting menu is still a bit buggy
- added a text popup for crafting
- made lakes have less straight edges and look more natural
- fixed items not dropping in correct position
- when new item is added to inventory, it is added to hotbar
- SHIFT-click to add item to hotbar in inventory screen
- fixed item_equipped textures crashing the game (have a blank image for every item that does not appear in NPCs hand)
- inventory API is completely different due to the changes, sorry!
- made flint tools stronger