Register callback for dismount

[LTRData]

Added two API functions DokanRegisterWaitForFileSystemClosed and DokanUnregisterWaitForFileSystemClosed, for registering and unregistering a callback to be called when the DeviceClosedWaitHandle is set. Makes it easier to register work to be done after dismount without letting a thread wait for it.

New feature.

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the existing documentation
• [x] My changes generate no new warnings
• [ ] I have updated the change log (Add/Change/Fix)
• [x] I have cleaned up the commit history (use rebase and squash)

Changes proposed in this pull request:

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[Liryna]

Hi @LTRData ,

That's a very good idea of API 🥇 ! Could you add them to the header with some documentation like the existing ones ? https://github.com/dokan-dev/dokany/blob/ce8b8229ad8262f920ca8d284448c1fe10e46cae/dokan/dokan.h#L878

[LTRData]

Hi @LTRData ,

That's a very good idea of API 🥇 ! Could you add them to the header with some documentation like the existing ones ? https://github.com/dokan-dev/dokany/blob/ce8b8229ad8262f920ca8d284448c1fe10e46cae/dokan/dokan.h#L878

Yes I'll do that! 👍

[LTRData]

Done!

[Liryna]

Thank you very much @LTRData ! I am currently blocked by https://github.com/dokan-dev/dokany/issues/648 until I can make a release including your changes. Hopefully, it can happen in the next days.

[LTRData]

Thank you!