Use Windows "aliases" to create symlinks

[dmerejkowsky]

This may improve the support for symlinks on windows.

Bug opened from a question asked by @Lecrapouille in #332

I just give a try with your symlink: command but Window wants the admin rights. Some people does not want to allow this right. Maybe i'm confused but for me since Windows 3.1 you have "aliases" to create shortcuts on applications on your desktop (and additionally pass some command line) so why tsrc does not offer this cheap aliases ?

[dmerejkowsky]

Adding "help wanted" : I'm not really sure how to create "aliases" on Windows from Python, nor what it would change for Windows users currently using the symlink feature

[Lecrapouille]

Ideas: https://docs.microsoft.com/en-us/sysinternals/downloads/junction
Python: https://stackoverflow.com/questions/1143260/create-ntfs-junction-point-in-python