Fixes for gcc 13, clang 16 and C++20

Marco Clemencicrequested to merge
clemenci/fixes-for-gcc13 into master
  • Avoid use of deprecated is_pod
  • Fix implicit capture of this (deprecated in C++20)
  • Remove unused variables

Note that implicit capture of this via [=] causes a warning in C++20, but the new way [=,this] causes a warning in C++17, so we hide the C++17 warning (at some point we will stop supporting C++17).

Edited by Marco Clemencic

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