Add DWARF-5

Martinrequested to merge
martin_frb/fpc-src:mfr/dwarf-5 into main

Add support for DWARF 5.

This will be needed as base for feature added in DWARF-5, such as

  • correct class var
  • full support of DW_TAG_string_type (char type, for widechar)

I tested with GDB 17.1 on Windows. It loaded a test app, and was able to set breakpoints and show data (so it was happy with the changes to line info, and CU-header).

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