[STORY] Clean up spefications of analysis classes

Epic: #17 Feature: Australian-Imaging-Service/pipelines#14 Feature Release: 1

Finalise specification of analysis classes via decorators.

[x] New unit tests to cover exceptions
[x] check inherited_from statements to ensure that it is referencing first class in MRO that contains attribute
[x] ensure that inherited pipelines don't remove outputs unless they explicitly set them to (output_name, NOTHING)
[x] add _dataset attribute to analysis classes
[x] check analysis classes for reserved names (dataset, menu, stack, anything else...)
[x] supported nested 'mapped_from' by "linked list" of nested tuples
[x] support passing sub analysis parameters by expanding SubanalysisDefault (renamed to SubanalysisInit) to take an argument with a dict
[ ] Write nested subanalysis unittest

ArcanaFramework / arcana