Add Presentation Mode

[TinasheMzondiwa]

Similar to what we have in the Android app we'd like to have a presentation mode.

• Add presentation icon to enter or exit full screen mode
• Break up the hymn into individual verses/sections
• Display one section at a time
• Add next and previous icons/ buttons to go to the next or previous section
• Repeat choruses

[YewoMhango]

Thanks, noted