tree_entry: IsFileSymlink and IsDirectorySymlink

[silverwind]

These two new functions would be required for go-gitea/gitea#1416. Issue is free to take ;)

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[tf198]

FollowLink() is now in master.
See #114 for details on equivalent usage.
Can this be closed?

[lafriks]

Yes I think it can be closed

[silverwind]

Nice work!