[KDev4] VCS interfaces draft

[dukju ahn]

I ported VCS extention interfaces from KDev3. This is mainly mere
port of KDev3, except

class VCSFileInfoMap's key value is changed.
Removed VCSFileInfoProvider. IVersionControl will provide fileinfo
to external world.

One question is that I don't know to which directory this file should
go. Other than that, everything seems to be straightforward.

Please review it and comment.
Thanks.
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