Fix refreshing token

[marioortizmanero]

Description

This fixes #224 by creating a wrapper for Mutex so that it's the same for both sync and async programming, similarly to how pagination works.

[marioortizmanero]

Ok so I've got it compiling without needing lots of #[cfg()]. The only problem is that there are probably lots of deadlocks, I should try to fix these before this is merged.

[marioortizmanero]

What do you think about renaming get_token to refresh_and_lock_token, @ramsayleung? Maybe it's too long but that function does a lot of things so it may make sense. I can do that in another PR to avoid making this one a mess.

[marioortizmanero]

While I'm at it I've also merged master onto this branch and fixed all the conflicts

[marioortizmanero]

Damnit, I've completely messed up the diff by merging master...

You can take a look at the commits manually:

• 2b2411b
• df5f9f1
• a5eb0a5
• 0dbda18

[marioortizmanero]

Well, this has become a mess. I'm having lots of trouble merging master... Would you mind re-doing the PR with the current master branch, @ramsayleung? It's probably going to be much easier than trying to merge with this super outdated branch.

It shouldn't be too hard, you can copy-paste most stuff (the examples and the mutex module, for one)

[ramsayleung]

Since everything else has been merged, we could continue work on #224 :)

Would you mind re-doing the PR with the current master branch, @ramsayleung? It's probably going to be much easier than trying to merge with this super outdated branch.

Do you mean I should create a new PR from the current master branch?

[marioortizmanero]

Do you mean I should create a new PR from the current master branch?

Yes. Unfortunately the merge conflicts are super hard to deal with, it'll be easier to do it from scratch in my opinion. Then you can add what I suggested at #255 to fix our problem.

[ramsayleung]

Did you run the with_auto_reauth example successfully? I got an stackoverflow error when I ran it. And I have created a new PR #262

[marioortizmanero]

That most likely means that there's unbounded recursivity somewhere, i. e. the auto reauth function calls something which calls the auto reauth again. I'll take a look later.