Xontrib-onepath

New type:
| Priority | Format | Example |
|----------|---------|----------|
| 1 | Full path to file. | `/etc/passwd` |

New types:
| Priority | Format | Example |
|----------|---------|----------|
| 6 | Any file. | `FILE` |
| 7 | Any directory. | `DIR` |
| 8 | Any file or directory. | `*` |

* Added `python-magic` to getting MIME types and avoiding subproc `file` call.
* Fixed opening files with spaces in the name.

Try it! It's like magic!