Rework the stats pane to be modular, add a short sample on how it works too

gui/builtinStatsViews/__init__.py

@@ -0,0 +1,8 @@
+__all__ = ["exampleView"]
+
+columns = {}
+def registerView(column):
+    columns[column.name] = column
+
+def getView(name):
+    return columns[name]