Nested Namespaces and their names

Hi all,

@ctrueden is currently working on "nested namespace". I think now it would be a good time to discuss our `Namespace`s a bit more in detail, i.e. which `Namespace` do we want and how to we want to nest them. Currently, our `Namespace` names are somehow mixed: `ImageNamespace` describes on what kind of input it operates, however for example the `FilterNamespace` describes more what it does.

Current `Namespaces`:
- `ConvertNamespace`, `CopyNamespace`, `CreateNamespace`, `DeconvolveNamespace`, `FilterNamespace`, `GeomNamespace`, `HaralickNamespace`, `ZernikeNamespace`, `ImageMomentsNamespace`, `ImageNamespace`, `LabelingNamespace`, `LBPNamespace`, `LogicNamespace`, `MathNamespace`, `StatsNamespace`, `TamuraNamespace`, `ThreadNamespace`, `Thresholdnamespace`

Here is one suggestions to start the discussion (I added some `Namespace`s):
- `Math`
*\* `FFT`
*\* `Logic`
*\* `Statistics`
*\* `Arithmetic`
- `Processing`
*\* `Thresholding`
*\* `Filters`
*\* `Morphological`
*\* `Convolution`
*\* `Deconvolution`
- `Features`
*\* `Pixel`
*\* `Object`
**\* `Intensity`
***\* `Haralick`, `Tamura`, `ImageMoments`, `Stats`, `Zernike`, `LBP`.
**\* `Geometric`
- `Transforms`
*\* `Convert`
*\* `Affine`
*\* `Dimensionality` (e.g. `Crop`, `RemoveDim`, etc).
- `Create`
*\* `Labeling`
*\* `Image`
*\* `Kernel`
*\* `Copy`
- `Control` (bad name)
*\* `Mappings`
*\* `Loops`
*\* ...
- `Segmentation` (in the future `CCA`, `Watershed`, `GraphCuts`, etc...).
- `Registration`
- `Threads` (?)

I've no idea if this is a good suggestion, but maybe it's good to get started.

Christian