[sfml] Install usage and change version scheme to relaxed

[ras0219]

See title. The SFML usage file was not being deployed.

[JackBoosY]

Current:

The package sfml:x86-windows provides CMake targets:

    find_package(SFML CONFIG REQUIRED)
    # Note: 7 target(s) were omitted.
    target_link_libraries(main PRIVATE FLAC OpenAL OpenGL Vorbis)

usage:

The package sfml provides CMake targets:

    find_package(SFML COMPONENTS system window graphics CONFIG REQUIRED)
    # Windows
    target_link_libraries(main PRIVATE FLAC OpenAL OpenGL Vorbis)
    # Linux/MacOS
    target_link_libraries(main PRIVATE X11 FLAC UDev OpenAL)

[Neumann-A]

that still looks wrong because the target_link_libraries call is not displaying sfml targets.

[ras0219]

New text is:

The package sfml provides CMake targets:

    find_package(SFML COMPONENTS system window graphics CONFIG REQUIRED)
    target_link_libraries(main PRIVATE sfml-system sfml-network sfml-graphics sfml-window)

    # If you want SFML to provide an implementation of main():
    target_link_libraries(main PRIVATE sfml-main)