Add todo comment
Add checkRow function

Determine which rows are effected by a completed row
Remove unwanted curle brackets
Add dropBlock function
Move move(DIR) function to block
Update dropBlock function to move blocks downward
Change dropBlocks to moveBlocks
Check 0 row and column
Add dropping state

For when blocks should move down rows after one or more has been cleared
Check if block is on the same row as any other block in the same piece
Fix logic for move a row downwards after clearing rows
Move dropping and clearing logic to private functions