Change to operate git via Libgit2

[CdecPGL]

[CdecPGL]

Libgit2Sharp is not suitable because Libgit2Sharp does not have some API to be used in this repositry like add -N.

[CdecPGL]

Unity crashed when loading LibGit2Sharp native dll probably because Libgit2Sharp is under development and it is unstable.
Revalidate and merge this changes after LibGit2Sharp becomes stable.