Lots of new cool things!

- Added ability to pick up items

- Now slimes drop slime and gel

- Added item name and amount display

- Added item rarities(common - white, uncommon - green, rare - blue, epic - purple and legendary - orange)

- Changed damage show text

- Added stackable items

- Added number that show amount of item if it is more then 1

- Added sword attack wave

- Added pickaxes(they work, but there aren't any resources to mine)