Install full set of application icons on Linux

Icons were already available in linux/icons directory.
Tidy linux/CMakeLists.txt.

Author: cjmayo

linux/CMakeLists.txt

@@ -1,19 +1,22 @@
 #icons
-## application icon
+set(sizes 8x8 16x16 22x22 24x24 32x32 36x36 42x42 48x48 64x64 72x72 80x80 96x96 128x128 192x192 256x256 512x512)
+
+# Install application icon
 install(FILES ${CMAKE_SOURCE_DIR}/images/icons/qgis_icon.svg RENAME qgis.svg DESTINATION share/icons/hicolor/scalable/apps)
-install(FILES ${CMAKE_SOURCE_DIR}/images/icons/qgis-icon-16x16.png RENAME qgis.png DESTINATION share/icons/hicolor/16x16/apps)
-install(FILES ${CMAKE_SOURCE_DIR}/images/icons/qgis-icon-512x512.png RENAME qgis.png DESTINATION share/icons/hicolor/512x512/apps)
+foreach(size ${sizes})
+  install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/icons/qgis-icon${size}.png RENAME qgis.png DESTINATION share/icons/hicolor/${size}/apps/)
+endforeach()
 
 # Install MIME type icon
 install(FILES ${CMAKE_SOURCE_DIR}/images/icons/qgis_mime_icon.svg RENAME qgis-mime.svg DESTINATION share/icons/hicolor/scalable/mimetypes)
-foreach(size 8x8 16x16 22x22 24x24 32x32 36x36 42x42 48x48 64x64 72x72 80x80 96x96 128x128 192x192 256x256 512x512)
-  install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/icons//qgis-mime-icon${size}.png RENAME qgis-mime.png DESTINATION share/icons/hicolor/${size}/mimetypes/)
+foreach(size ${sizes})
+  install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/icons/qgis-mime-icon${size}.png RENAME qgis-mime.png DESTINATION share/icons/hicolor/${size}/mimetypes/)
 endforeach()
 
 # Install QGIS file formats icons
 foreach(_type qgs qlr qml qpt)
   install(FILES ${CMAKE_SOURCE_DIR}/images/icons/qgis_${_type}_icon.svg RENAME qgis_${_type}.svg DESTINATION share/icons/hicolor/scalable/mimetypes/)
-  foreach(size 8x8 16x16 22x22 24x24 32x32 36x36 42x42 48x48 64x64 72x72 80x80 96x96 128x128 192x192 256x256 512x512)
+  foreach(size ${sizes})
     install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/icons/qgis-${_type}${size}.png RENAME qgis-${_type}.png DESTINATION share/icons/hicolor/${size}/mimetypes/)
   endforeach()
 endforeach()