add outputPath Config

[ringcrl]

add outputPath config for leetcode #119

Change Request,Need Help...Find a way to get a Problem difficulty...

[jdneo]

@ringcrl

I think there is still some misunderstanding here. The aim of add the setting leetcode.outputPath is to make it possible for the users to categorize the files as their wish. So instead of make it as a enum setting, we should make it as a plain string.

Let me explain more about it:

The setting of leetcode.outputPath has no default value, which means it is empty by default. And, by default, when the user click show problem, the file goes to the base path of the workspace folder.

If the user set some values to it, for example: 'happy' then the file goes to the folder called happy

Meanwhile, besides let the user customize the output folder, we will also provide some special values, which are, as you know, ${tag}, ${language}, ${difficulty}. This means the user needs to explicitly brace the value with ${}, then the extension will get to know that: Oh, this is not a general path. I need to traslate it to another value...

Do you get my point?

[ringcrl]

Thank you very much, I have made changes.

[ringcrl]

Thank you very much for these helpful suggestions.

[jdneo]

Though type casting from LeetCodeNode to IProblem is fine. Let's add getter in LeetCodeNode to get the data, which is typed as IProblem.

It looks like I need to do some refactors here later after this PR, The definition of LeetCodeNode and IProblem is overlapped.

[ringcrl]

Add tag selector

[jdneo]

@ringcrl Looks much better now.

I just did some changes and merged the PR.

Thank you for your contribution.