itk: migrate to Conan v2

[Nekto89]

Specify library name and version: itk/all

Use CMakeToolchain and update dependencies.
dcmtk had to be turned off because of OpenSSL conflict - Windows version uses openssl 1.0.2 for some reason and gdcm can use 1.1.1 or 3+.

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• I've read the contributing guidelines.
• I've used a recent Conan client version close to the currently deployed.
• I've tried at least one configuration locally with the conan-center hook activated.

[Nekto89]

I'm trying to reproduce problems locally and on Windows with conan 2.0.7 hdf5 doesn't have any include directories. I can't understand what is wrong. I've already tried using different target names with no success.
I've tried building hdf5 and there I don't have any problems -
recipes\hdf5\all>conan create --version 1.14.1 --build=missing -s compiler.cppstd=17 .
hdf5\all\test_package\build\msvc-193-x86_64-17-release\generators\HDF5-release-x86_64-data.cmake

set(hdf5_INCLUDE_DIRS_RELEASE "${hdf5_PACKAGE_FOLDER_RELEASE}/include"
			"${hdf5_PACKAGE_FOLDER_RELEASE}/include/hdf5")

With itk test_package include dirs are empty.
conan create --version 5.1.0 --build=missing -s compiler.cppstd=17 .
itk\all\test_package\build\msvc-193-x86_64-17-release\generators\HDF5-release-x86_64-data.cmake
set(hdf5_INCLUDE_DIRS_RELEASE )

[Nekto89]

dcmtk isn't conan v2 ready

[Nekto89]

@uilianries @SpaceIm @jgsogo Could someone please review?

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 7 (186919c94e5e94fa277bd944a9eb1d1606e40734):

• itk/5.1.0@:
  All packages built successfully! (All logs)

• itk/5.1.2@:
  All packages built successfully! (All logs)

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Conan v2 pipeline ✔️

Note: Conan v2 builds may be required once they are on the v2 ready list

All green in build 5 (186919c94e5e94fa277bd944a9eb1d1606e40734):

• itk/5.1.2@:
  All packages built successfully! (All logs)

• itk/5.1.0@:
  All packages built successfully! (All logs)

[uilianries]

@Nekto89 Thank you for updating this recipe, it's not a regular project and demanded a lot of effort!