change exporters, processors, samplers into handle classes. Fixes #202 #239
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Exporters, processors (or readers), view, samplers are all backed by a C++ proxy. It makes sense for them to be handle classes because of their proxies.
It is possible to make them to behave completely like a value class, by creating new proxies everything their properties are changed. But that would results in more code and therefore more maintenance, for little gain.
Fixes #202