CMSIS-DSP: Refactoring of the PythonWrapper and SDF

Refactoring to enable improvements to the wrapper and to be able to
upload it to the Python repository.
diff --git a/CMSIS/DSP/cmsisdsp/version.py b/CMSIS/DSP/cmsisdsp/version.py
new file mode 100755
index 0000000..a955fda
--- /dev/null
+++ b/CMSIS/DSP/cmsisdsp/version.py
@@ -0,0 +1 @@
+__version__ = "1.2.1"