More configurable path

[user202729]

cf parse, cf submit and cf clone should work fine now. The rest should be unaffected.

---

Should fix #67.

I think the current cf clone is incorrect (the directory structure generated cannot be parsed by cf submit) (not tested)

I don't know if there's any part of the code that modifies the other parts of the info. (in that case the path is no longer correct, and it's necessary to store the configuration option in the info object to dynamically compute the path when needed)

% is used to escape the patterns. To have a %, enter two percents. Path separator is always slash, even on Windows. The path specifier is listed in decreasing priority.

The default-generated configuration is the same as the >=0.9.0 behavior. Pre-0.9.0 behavior can be set by something like this

    [
      "contest",
      "%contestID%/%problemID%"
    ],
    [
      "gym",
      "%contestID%/%problemID%"
    ],
    [
      "group",
      "group_%groupID%/%contestID%/%problemID%"
    ],
    [
      "acmsguru",
      "acmsguru/%problemID%"
    ]

[gnojus]

Maybe use map instead off array in this configuration?
I'm also thinking that we should support comments in config, with something like this: https://github.com/muhammadmuzzammil1998/jsonc.

[user202729]

Maybe use map instead off array in this configuration?

->

The path specifier is listed in decreasing priority.

[gnojus]

Oh. Then I would still prefer something like

[
    {
      "type": "contest",
      "path": "%contestID%/%problemID%"
    },
    {
      "type": "gym",
      "path": "%contestID%/%problemID%"
    },
    {
      "type": "group",
      "path": "group_%groupID%/%contestID%/%problemID%"
    },
    {
      "type": "acmsguru",
      "path": "acmsguru/%problemID%"
    }
]

Just to avoid the inner arrays

[user202729]

The change is actually pretty intrusive -- with the other code unchanged, it's not possible to configure the problem directory path -- so for example it would not be possible to use %contestID%_%problemID%. Since I didn't change the "other code" now it would parse to (contest)/(problem)/(problem)/ directory instead.