Returns a TConfigStorage usable for storing options of IDE plugins.
Set LoadFromDisk to true to load the old content on disk. If you want to save your options and clear the old options set LoadFromDisk to false. Otherwise you will merge options. Every IDE plugin should use its own file for storing options. Especially you must not store extra options in the other option files. For an example and more details see http://wiki.lazarus.freepascal.org/Extending_the_IDE#Load.2FSave_settings