updated win condition

The game is winnable again, however diagonal wins only work on a decreasing angle.

TODO:
- Fix increasing angle win condition
- Code golf goal: 100 lines of code total
- Add endgame draw condition
- Change input to redraw after selection without pressing enter
- Be more descriptive of commands in original message
- Current system invalid move ends game
- Current system inserting into a full column loses a turn for that player
- Improve cost of win condition? Check only after insert?