4cd95a2921805f447a8bcecc6b448a365171eb93 refactor: modernize remaining outdated trait patterns (Lőrinc)
ab2b67fce20fd7d8017f8a26425cab99e91f420d scripted-diff: modernize outdated trait patterns - values (Lőrinc)
8327889f358289f918d04ddb9469fb5562720bf4 scripted-diff: modernize outdated trait patterns - types (Lőrinc)
Pull request description:
The use of [`std::underlying_type_t<T>`](https://en.cppreference.com/w/cpp/types/underlying_type) or [`std::is_enum_v<T>`](https://en.cppreference.com/w/cpp/types/is_enum) (and similar ones, introduced in C++14) replace the `typename std::underlying_type<T>::type` and `std::is_enum<T>::value` constructs (available in C++11).
The `_t` and `_v` helper alias templates offer a more concise way to extract the type and value directly.
I've modified the instances I found in the codebase one-by-one (noticed them while investigating https://github.com/bitcoin/bitcoin/pull/31868), and afterwards extracted scripted diff commits to do the trivial ones automatically.
The last commit contains the values that were easier done manually.
I've excluded changes from `src/bench/nanobench.h`, `src/leveldb`, `src/minisketch`, `src/span.h` and `src/sync.h` - let me know if you think they should be included instead.
A few of the code changes can also be reproduced by clang-tidy (but not all of them):
```bash
cmake -B build -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DBUILD_BENCH=ON -DBUILD_FUZZ_BINARY=ON -DBUILD_FOR_FUZZING=ON && cmake --build build -j$(nproc)
run-clang-tidy -quiet -p build -j $(nproc) -checks='-*,modernize-type-traits' -fix $(git grep -lE '::(value|type)' ./src ':(exclude)src/bench/nanobench.h' ':(exclude)src/leveldb' ':(exclude)src/minisketch' ':(exclude)src/span.h' ':(exclude)src/sync.h')
```
ACKs for top commit:
laanwj:
Concept and code review ACK 4cd95a2921805f447a8bcecc6b448a365171eb93
Tree-SHA512: a4bcf0f267c0f4e02983b4d548ed6f58d464ec379ac5cd1f998b9ec0cf698b53a9f2557a05a342b661f1d94adefc9a0ce2dc8f764d49453aaea95451e2c4c581
a799415d84