Read and write submodule branch Option #1301 #1915
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Allows for reading and writing the branch option from .gitmodules
requested a while ago in #1301
submodule.Branch can be read (string) and set (string) to change the branch option in .gitmodules
If a branch option was not set Branch will return null (libgit2 submodule_branch return value)
This helps in automated environments to checkout the correct tip (e.g. specific feature branch) and automatically publish changes back to the correct branch.