Fixed indexing bugs with the Board class. Also fixed cin bug, so program no longer prints out unecessary error message.
Changed _board variable type from vector<vector<bool>> to vector<vector<char>> to make it easier to see what is there.
Added function to attack ships. Pretty neat!
Refactored a little and moved all prompts into their own functions in their own file!
Refactored and made a typename to change pair<int, int> to Coordinate for readability.
Attempted once more to refactor directional checks when placing ships. Attempted implementation is still included in source, but is not being used.