Added ValueBuffer implementation and simple recording

ValueBuffer is now the default buffer object for storing data for
recording and processing purposes, a simple recording implementation has
been done, core.py example starts recording as soon as the core has
started then on exit it saves the output as a csv file through the
ValueBuffer export_csv method

.gitignore

@@ -8,3 +8,7 @@ wheels/
 
 # Virtual environments
 .venv
+
+# Output files
+*.csv
+*.dlpak