Manually re-add recent gui additions from master that were not merged because of the file restructuring:
- flood correction inputs
- debug check box
- include-partial-bins check box

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Add unit tests for all combinations of start/end being set/unset and valid/invalid

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This uses zero as a special value to mean unset. The range can be checked to see if it's valid depending on whether both or none must be set together. This is true for the background range, but the other ranges can have min/max set independently.

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The range is not set in the model if the user enters invalid values

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Stitch params are now validated immediately rather than alongside the per-theta defaults

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This assumes that the value always exists, which it will once pre-populated models are injected into the constructors

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Also tidied file layouts to be more consistent.

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- Tidied up some of the validation, moved some of the logic out of the
Experiment Presenter and into a new table validator class.
- Generalized RowValidationResult into ValidationResult.

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Re #2263

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- Prevented warning dialog for non-unique angles from showing when
  not modifying the angles. The red highlighting remains.
- Moved additional classes out of Experiment presenter and split some
  of the validation up into smaller functions

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