A lot of fixes and improvements

Home screen:
- remove left to search as we don't want to use global search addon
- [important fix] permanently enable System tab on homescreen with
submenu. could be missing in previous versions
- display 11th item completely. more than 11 items are not displayed
correctly as we don't have enough room
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- disable extrafanart option --> need to delete this from all views in a
future update
- remove "extrafanart on gallery view" option
- modify strings.xml for new behaviour
- remove Animate Backgrounds option
- remove Xperience1080 OSD animations --> need to clean code from
unwanted OSDs
- small fixes for the previously introduced new rating flag on slide
view