Embed git in package

package.ps1 fetches PortableGit and embeds it in the package. This
eliminates all but one runtime dependency (MSVC++ Redistributable).

* Move Python into a new FOSS folder.

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diff --git a/FOSS/Python/Dependencies/future-0.18.2/docs/futurize_overview.rst b/FOSS/Python/Dependencies/future-0.18.2/docs/futurize_overview.rst
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+The ``futurize`` script passes Python 2 code through all the appropriate fixers
+to turn it into valid Python 3 code, and then adds ``__future__`` and
+``future`` package imports to re-enable compatibility with Python 2.
+
+For example, running ``futurize`` turns this Python 2 code:
+
+.. code-block:: python
+
+    import ConfigParser                 # Py2 module name
+
+    class Upper(object):
+        def __init__(self, iterable):
+            self._iter = iter(iterable)
+        def next(self):                 # Py2-style iterator interface
+            return next(self._iter).upper()
+        def __iter__(self):
+            return self
+
+    itr = Upper('hello')
+    print next(itr),
+    for letter in itr:
+        print letter,                   # Py2-style print statement
+
+into this code which runs on both Py2 and Py3:
+
+.. code-block:: python
+
+    from __future__ import print_function
+    from future import standard_library
+    standard_library.install_aliases()
+    from future.builtins import next
+    from future.builtins import object
+    import configparser                 # Py3-style import
+
+    class Upper(object):
+        def __init__(self, iterable):
+            self._iter = iter(iterable)
+        def __next__(self):             # Py3-style iterator interface
+            return next(self._iter).upper()
+        def __iter__(self):
+            return self
+
+    itr = Upper('hello')
+    print(next(itr), end=' ')           # Py3-style print function
+    for letter in itr:
+        print(letter, end=' ')
+
+
+To write out all the changes to your Python files that ``futurize`` suggests,
+use the ``-w`` flag.
+
+For complex projects, it is probably best to divide the porting into two stages.
+Stage 1 is for "safe" changes that modernize the code but do not break Python
+2.7 compatibility or introduce a dependency on the ``future`` package. Stage 2
+is to complete the process.