UPX 4.0.0 released

[Stefan]

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User visible changes for UPX
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Changes in 4.0.0 (28 Oct 2022):
  * Switch to semantic versioning
  * SECURITY NOTES: emphasize the security context in the docs
  * Support easy building from source code with CMake
  * Support easy rebuilding the stubs from source with Podman/Docker
  * Add integrated doctest C++ testing framework
  * Add support for EFI files (PE x86; Kornel Pal)
  * bug fixes - see https://github.com/upx/upx/milestone/6
  * bug fixes - see https://github.com/upx/upx/milestone/7

[Stefan]

Changes in 4.0.1 (16 Nov 2022):
  * bug fixes - see https://github.com/upx/upx/milestone/8

[Stefan]

Changes in 4.0.2 (30 Jan 2023):

  * bug fixes - see https://github.com/upx/upx/milestone/9