apps: Replace del self.x with self.x = None in all apps

Testing has demonstrated that del self.x does not make the memory used to
store x available for garbage collection.

There is clearly an additional reference from another place. In fact
*after* del self.x then the memory can be made available for GC by
assignment (e.g. self.x = None). However I haven't found how to release
this reference and there is nothing in self.__dict__ that can help.

For now we'll use a twp-step process where we set the variable to None
before deleting it.

This has a big impact on memory usage. For Software it is almost 1k
(a.k.a. about 10% impact on free RAM).

Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>

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