Feature/461 freeze data containers #469
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This PR has the goal to make most datasets and datatypes immutable (or 'frozen'), in preparation for hashing, caching and provenance tracking.
The DataContainer including its subclasses EITData, ContinuousData, IntervalData and SparseData are now frozen.
They all get the method
update(**kwargs)which creates a copy with some attributes replaced.Arrays that are a part of any of these objects are made unwriteable. Most arrays are put in a memoryview, which makes it impossible to ever write to them again. If the array contains objects this is not possible; then the WRITEABLE flag is set to False. This is not 100% save, but should be enough to make sure nobody changes it by accident.
Not all features have been adapted. The features requiring PixelBreath have not been updated. PixelBreath will be updated before this PR is finalized.