Move the icons to the icons folder

There was no reason at all to keep those icons on the root
folder.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

CMakeLists.txt

@@ -659,7 +659,7 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
 	install(DIRECTORY marbledata/bitmaps DESTINATION share/subsurface/data)
 	install(FILES subsurface.debug DESTINATION bin)
 	install(FILES subsurface.desktop DESTINATION share/applications)
-	install(FILES subsurface-icon.svg DESTINATION share/icons/hicolor/scalable/apps)
+	install(FILES icons/subsurface-icon.svg DESTINATION share/icons/hicolor/scalable/apps)
 	install(DIRECTORY Documentation/images DESTINATION share/subsurface/Documentation)
 	install(FILES ${DOCFILES} DESTINATION share/subsurface/Documentation)
 	install(DIRECTORY theme DESTINATION share/subsurface)