Fix FHS install dirs (#5930)

Install .desktop files into /usr/share/applications.
Install PNGs for the above into /usr/share/icons.
Install udev rules into /lib/udev/rules.d.

CMakeLists.txt

@@ -559,9 +559,20 @@ if (WIN32)
 elseif (SLIC3R_FHS)
     # CMAKE_INSTALL_FULL_DATAROOTDIR: read-only architecture-independent data root (share)
     set(SLIC3R_FHS_RESOURCES "${CMAKE_INSTALL_FULL_DATAROOTDIR}/PrusaSlicer")
-    install(DIRECTORY "${SLIC3R_RESOURCES_DIR}/" DESTINATION "${SLIC3R_FHS_RESOURCES}")
-    install(FILES src/platform/unix/PrusaSlicer.desktop DESTINATION ${SLIC3R_FHS_RESOURCES}/applications)
-    install(FILES src/platform/unix/PrusaGcodeviewer.desktop DESTINATION ${SLIC3R_FHS_RESOURCES}/applications)
+    install(DIRECTORY ${SLIC3R_RESOURCES_DIR}/ DESTINATION ${SLIC3R_FHS_RESOURCES}
+        PATTERN "*/data" EXCLUDE PATTERN "*/udev" EXCLUDE
+    )
+    install(FILES src/platform/unix/PrusaSlicer.desktop DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/applications)
+    install(FILES src/platform/unix/PrusaGcodeviewer.desktop DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/applications)
+    foreach(SIZE 32 128 192)
+        install(FILES ${SLIC3R_RESOURCES_DIR}/icons/PrusaSlicer_${SIZE}px.png
+            DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/${SIZE}x${SIZE}/apps RENAME PrusaSlicer.png
+        )
+        install(FILES ${SLIC3R_RESOURCES_DIR}/icons/PrusaSlicer-gcodeviewer_${SIZE}px.png
+            DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/${SIZE}x${SIZE}/apps RENAME PrusaSlicer-gcodeviewer.png
+        )
+    endforeach()
+    install(DIRECTORY ${SLIC3R_RESOURCES_DIR}/udev/ DESTINATION lib/udev/rules.d)
 else ()
     install(FILES src/platform/unix/PrusaSlicer.desktop DESTINATION ${CMAKE_INSTALL_PREFIX}/resources/applications)
     install(FILES src/platform/unix/PrusaGcodeviewer.desktop DESTINATION ${CMAKE_INSTALL_PREFIX}/resources/applications)