Fixed an issue with DokanUnmount() failing to unmount a drive

[Corillian]

This fix also applies to dokanctl.exe /u
Enabled debug information for dokan.dll and dokannp.dll when compiling
in Debug so that I could debug
Issue #57

[Liryna]

Thanks for this PR ❤️ and taking the time in your issue :D !

To finish to normalizing mount paths, don't you think we should also change the mount function to force the M:\ ?
https://github.com/Corillian/dokany/blob/InvestigateHang/dokan_mount/mount.c#L263

And also fix the mirror 😄 https://github.com/Corillian/dokany/blob/InvestigateHang/dokan_mirror/mirror.c#L51

[Corillian]

Hey sorry got sidetracked with working on other stuff. Yeah I can add normalization to mirror and mount.

[Corillian]

Ok I added the normalization to mounter.exe as that seems to be the only place where it matters. Drive letter names are normalized to the format "C:" upon insertion into g_MountList as well as when g_MountList is being searched. I also updated this branch to the latest on master. Let me know if I missed anything.

[Liryna]

Thank you @Corillian and for taking the time !
I will try to take a look this weekend :)

[Liryna]

Perfectly working on my side after test !
Thank a lot @Corillian for your contributions in the dokan project !

Normalizing the mount point will help a lot the dev & users of dokan !