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This is a partial import of for mono.

Since is massive and we only need partial source tree of it (and due to some checkout failure on Linux [*1]), we set up another repository for mono submodule.

This tree is hence manually imported. Though it is somewhat easy to maintain: we can cherry-pick changes only in Rx.NET in the Mostly we would not need to copy sources from the original treemanually, but sometimes we do when a checkout involves other directories than Rx.NET.

For every original release, we should import the updates and commit to this master, then create a branch for each release and then apply our local changes (which is minimum but required) to the branch.