Remove ParameterType_Empty

Closes #1770

See merge request orfeotoolbox/otb!307

Add missing listview to doxygen

See merge request orfeotoolbox/otb!312

BUG : clean fftw threads only if fftw is used

See merge request orfeotoolbox/otb!313

ENH : Add metadata to Sentinel 1 Model

See merge request orfeotoolbox/otb!298

ENH: update cmake minimum required in tutorial

See merge request orfeotoolbox/otb!311

BUG: fix verbosity of libsvm

See merge request orfeotoolbox/otb!308

Verbose libsvm is only enabled when building in Debug

enhance SarSensorModelAdapter

See merge request orfeotoolbox/otb!289

BUG: compat of QgisDescriptor with old params

See merge request orfeotoolbox/otb!305

In remote modules for instance, old params such as EmptyParameter
or ComplexInputImageParameter are still in use. We can ensure
that QgisDescriptor support them.

Add Functor module with FunctorImageFilter

See merge request orfeotoolbox/otb!299

BUG:  Quick fix for Mellin test

See merge request orfeotoolbox/otb!304

BUG: missing ComplexImage params in QGis wrapper

See merge request orfeotoolbox/otb!303

TEST: use different test output names

See merge request orfeotoolbox/otb!302

Even if these parameters are deprecated, the generator should at least recognize them and treat them as normal images

ENH: initialize the number of openMP threads after any modification by command line

See merge request orfeotoolbox/otb!301

Merge branch 'functorfilter-take2' of https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb into functorfilter-take2

Update deprecated cmake policies to NEW

See merge request orfeotoolbox/otb!295

PKG: enable diapotb in SuperBuild with RemoteModules

See merge request orfeotoolbox/otb!300