MEGA Karaoke Songbook

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- new built-in songbook: Platinum Piano XL SD
- renamed Update to Release
- highlight current list on side drawer
- added Web search in song and artist long-press menu
- when renaming multiple artists, click on one of the names to use it in the edit box
- added default icons for the following song types (case sensitive): RS, PRS, OLS, Training, Multiplex, Chorus