Use _t and _v traits instead of ::type and ::value

[leekillough]

This changes the code to use trait_t<...> for typename trait<...>::type (C++14) and trait_v<...> for trait<...>::value (C++17), and refactors the ElementBuilder to define is_tuple_constructible_v<...> in terms of is_tuple_constructible<...>::value and apply it recursively.

For serialization code which depends on Boolean traits tests, if constexpr( ... ) is used for the if-tests, since the controlling expression is constant and can be optimized at compile-time, and because this allows the code in the future to use operations or access fields which are only valid for certain template arguments.

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[kpgriesser]

My previous (deleted) note was based on the wrong branch. I've since run on the correct branch and it compiles cleanly and passes our latest tests.

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Test Name: SST__AutotestGen2_NewFW_sst-test_OMPI-4.1.4_PY3.6_sst-elements

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Test Name: SST__AutotestGen2_NewFW_sst-test_OMPI-4.1.4_PY3.6_sst-elements_MR-2

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• Build Num: 1777
• Status: STARTED

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Test Name: SST__AutotestGen2_NewFW_sst-test_OMPI-4.1.4_PY3.6_sst-macro_withsstcore

• Build Num: 783
• Status: STARTED

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• Build Num: 208
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Using Repos:

Repo: CORE (leekillough/sst-core)

• Branch: use_t_v_traits
• SHA: bd67323
• Mode: TEST_REPO

Repo: SQE (sstsimulator/sst-sqe)

• Branch: devel
• SHA: 47b431f8e666f02922ea3ef21a2c0ccc36de5de5
• Mode: SUPPORT_REPO

Repo: ELEMENTS (sstsimulator/sst-elements)

• Branch: devel
• SHA: 3db9045ced2dce01d844f87b1fe001efd8868a60
• Mode: SUPPORT_REPO

Repo: MACRO (sstsimulator/sst-macro)

• Branch: devel
• SHA: e211a97813a499816de44ccd603da04719f81f18
• Mode: SUPPORT_REPO

Pull Request Author: leekillough

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• Build Num: 1777
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Build Information

Test Name: SST__AutotestGen2_NewFW_sst-test_OMPI-4.1.4_PY3.6_sst-macro_withsstcore

• Build Num: 783
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Build Information

Test Name: SST__AutotestGen2_NewFW_sst-test_OMPI-4.1.4_PY3.6_sst-core_Make-Dist

• Build Num: 638
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Build Information

Test Name: SST__AutotestGen2_NewFW_sst-test_Clang-Format_sst-core

• Build Num: 592
• Status: PASSED

Build Information

Test Name: SST__AutotestGen2_NewFW_OSX-14-XC15-ARM2_OMPI-4.1.6_PY3.10_sst-elements

• Build Num: 346
• Status: PASSED

Build Information

Test Name: SST__AutotestGen2_NewFW_OSX-14-XC15-ARM2_OMPI-4.1.6_PY3.10_sst-macro_withsstcore

• Build Num: 208
• Status: PASSED

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