ternlog 0.1.0

Ternary logic operations on integer types
Documentation 
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# Ternary logic

Compute "ternary logic" using an 8-entry lookup table.

For each bit, the expression will be computed as:
| `a` | `b` | `c` | `lut`                 |
| --- | --- | --- | --------------------- |
| `0` | `0` | `0` | `lut & (1 << 0) != 0` |
| `0` | `0` | `1` | `lut & (1 << 1) != 0` |
| `0` | `1` | `0` | `lut & (1 << 2) != 0` |
| `0` | `1` | `1` | `lut & (1 << 3) != 0` |
| `1` | `0` | `0` | `lut & (1 << 4) != 0` |
| `1` | `0` | `1` | `lut & (1 << 5) != 0` |
| `1` | `1` | `0` | `lut & (1 << 6) != 0` |
| `1` | `1` | `1` | `lut & (1 << 7) != 0` |

## Example

```
// if sprite_mask { background } else { sprite }
background.ternlog(sprite, sprite_mask, 0xe4)
```