Minesweeper solver

A minesweeper solver written in Zig.


The following cell representations are used for input boards:
- `#` for an unclicked cell
- `<N>` where `N=0,1,2,...` is a number shown in a cell
- `.` as an alternative to `0` (since the number 0 is not normally shown)
- `*` to represent a single mine (may be a revealed mine or a flag)
- `*<N>` where `N=1,2,...` is the number of mines


Example usage:
```
>>> import zig_minesolver
>>> board = """
... # 2 # # #
... # # # # #
... # 3 # # #
... # 2 # 4 #
... # # # # #
... """
>>> probs = zig_minesolver.get_board_probs(board, mines=8)
>>> print("

".join(str(x) for x in probs)) [0.27108, 0.0, 0.27108, 0.31325, 0.31325] [0.48594, 0.48594, 0.48594, 0.31325, 0.31325] [0.26506, 0.0, 0.50602, 0.5494, 0.5494] [0.26506, 0.0, 0.50602, 0.0, 0.5494] [0.10843, 0.10843, 0.24096, 0.5494, 0.5494] >>> ```