Added a clearer description to Diglett.cpp. Also fixed misspelling of "deprecated".
Overloaded WorldData::getTile() with a wrapper function so that it can take a Vector2i object instead of two ints.
Added a reset() method to Physics that resets velocity to zero. To be used after the player has finished digging a block.
Added a constant for the number of ticks it takes for the player to dig a block.
Added code such that the player enters a digging state when digging a block, and moves towards the block automatically until they reach the center, and then the block is dug.