Refactor in Modules/Wrappers/QtWidget

See merge request orfeotoolbox/otb!161

Merge release-6.6 into develop without the shark revert

Closes #1633

See merge request orfeotoolbox/otb!160

BUG: Improve Convert and DynamicConvert mask handling (fix #1647)

Closes #1647

See merge request orfeotoolbox/otb!159

ENH: Add box kernel to morphological operations apps

See merge request orfeotoolbox/otb!158

Refactor of otbWrapperApplication.h

See merge request orfeotoolbox/otb!150

This reverts commit 81bed5ae, reversing
changes made to f3749c05.

ENH: Document that conversion applications in otb don't support complex pixel types as output

See merge request !153

ENH: Allow to compute modulus and phase from 2 bands scalar image

See merge request !154

BUG fix issue 1656 related to eratic behavior of cmake configuration

Closes #1656

See merge request !156

rename files with txx extension to hxx

See merge request !152

For now complex pixel types are not supported by Convert and DynamicConvert
applications (see switch/case in the generic DoExecute method). This commit just
document this limitation.

Note that the ExtractROI application can be used to convert image from/to
complex image.

The support of complex images in otb applications as improved in version
6.6. There is generic mechanism based on teh ClampImageFilter which allow to
go from/to complex or multi-bands scalar images.

The only change is to read the input image as ComplexFloatImageType which
support both complex image (single band) or image with 2 bands which corresponds
to the real and imaginary parts.

The documentation of the application has been updated to reflect this
modification.