Use ImageMetadata to manage NoData and TileHint

See merge request !863

REFAC: remove otb::ChangeInformationImageFilter as it has no use anymore (note that the itk base class is still used in OTB)

REFAC: use ImageMetadata instead of itk dictionary to manage NoData in the applymask mode of ManageNoData

Add INFO message about metadata source

See merge request !862

Fix warning message related to metadata reading

See merge request !860

Optimize coordinate transformations in SARSensorModel

See merge request !858

Fixes in Sar metadata IOs

See merge request !861

Fix segfault in Ice and Monteverdi

See merge request !859

Update Python to 3.8 on CI builds

See merge request !856

Resolve "OTB stand alone package not support the virtual filesystem"

Closes #2212

See merge request !857

PERF: use the same transform objects for all coordinate transformation of the same type in otb::SarSensorModel