libtommath: migrate to Conan v2

[valgur]

Continues from #16558 with minimal changes (also resolves #16558).

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[uilianries]

both all and cmake folders are using CMake. Please, merge them if possible.

[valgur]

Good idea. Done.

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[valgur]

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[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[valgur]

.

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[valgur]

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[uilianries]

@valgur Thank you for continuing this PR.

I did a few changes on this PR, in order to simplify it:

• The version 1.3.0 includes CMakeLists.txt in its root folder. Supporting only this version simplifies the recipes a lot too.
• The upstream can not export symbols on Windows to generate a .dll. So I dropped shared library as well on Windows
• Simplified the test package to only validate the library.
• Dropped Windows debug support for now. First, CCI don't build package on Debug due the lower number the downloads and other topics, so we can not validate. Second, the upstream recommends inject /O1 instead of the default Cmake configuration /Og. In case an user really need Debug build type, then an issue can be opened to discuss this topic, but would need to pass CMAKE_C_FLAGS_DEBUG or similar.

Doing extra review.

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3 out of 4 committers have signed the CLA.

✅ prince-chrismc
✅ jowr
✅ uilianries
❌ Martin Valgur

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