[EXPLORER] start reworking some code for loading/saving settings implementation CORE...

[EXPLORER] start reworking some code for loading/saving settings implementation CORE-11498

- Rename the settings structure to something more meaningful for using it for all taskbar related settings
- define some default settings
- check checkboxes with settings values in the properties window
- move saving the settings to an own function which will be implemented later

svn path=/trunk/; revision=74307