P8tool can't seem to write files
Hi, I've just setup picotool but any command that tries to create a file seems to be failing. I've followed the installation instructions exactly, but I get the following traceback whenever I try to run the build or write commands.

```
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\kyle\\AppData\\Local\\Programs\\Python\\Python310\\lib\\site-packages\\pico8\\game\\empty_023.p8.png'  
```

My python is version 3.10.2, pip is version 22.0.4 and picotool itself. I'm running picotool on Windows 10.

Has anyone else run into this issue? Or perhaps there is another reason why picotool is failing to write temporary files in its package directory?
