Make mode lines consistent in .cpp/.hpp files

[TudorGR]

• Resolves: Make mode lines consistent in .cpp/.hpp files (add Emacs at top, Vim at end) #13329
• Target version: master

Summary

This PR ensures all .cpp/.hpp files have consistent editor modelines (Emacs at top, Vim at end), as specified in issue #13329.

Changes made:

• Added Emacs modeline at top for files that were missing it:

  • clang/plugin.cpp
  • clang/test/capture.cpp
  • clang/test/refcounting.cpp

• Fixed Emacs modeline (changed Mode: C to Mode: C++) for:

  • common/CoolMount.cpp
  • tools/map.cpp
  • tools/mount.cpp

• Added both Emacs (top) and Vim (bottom) modelines for:

  • wsd/PlatformDesktop.hpp
  • wsd/PlatformMobile.hpp
  • wsd/PlatformUnix.hpp
  • wsd/SslConfig.hpp

All modelines now follow the standard format:

• Emacs: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
• Vim: /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

TODO

• Add missing Emacs modelines
• Fix incorrect Mode: C to Mode: C++
• Add missing Vim modelines

Checklist

• I have run make prettier-write and formatted the code.
• All commits have Change-Id
• I have run tests with make check
• I have issued make run and manually verified that everything looks okay
• Documentation (manuals or wiki) has been updated or is not required

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