[Trigger] Zorro: Fix various C++ issues

[vkucera]

• Member variable ... is not initialized in the constructor. (cppcheck)
• Function parameter ... should be passed by const reference. (cppcheck)
• Searching before insertion is not necessary. Use try_emplace instead. (cppcheck)
• Use static_cast instead of deprecated casting style. (cpplint)
• IWYU (clang-tidy)
• Include external headers with <>. (manual)
• Sort includes. (clang-format)
• Replace size_t with std::size_t.
• Use const& to iterate std::vector<ZorroHelper>. (O2 linter)

[github-actions]

O2 linter results: ❌ 21 errors, ⚠️ 0 warnings, 🔕 0 disabled

[mpuccio]

Have you checked that there is no functional change? If so, we can merge

[vkucera]

Have you checked that there is no functional change? If so, we can merge

Yes