Bomb Enemy

Given a 2D grid, each cell is `'W'` (wall), `'E'` (enemy), or `'0'` (empty), return the maximum number of enemies you can eliminate by placing a bomb in an empty cell. The bomb kills all enemies in the same row and column until a wall blocks it. **Example:** ``` Grid: [['0','E','0','0'], ['E','0','W','E'], ['0','E','0','0']] ``` Output: `3` (placing bomb at (1,1) kills 3 enemies)