Add new option under "General Settings" called "Tablet Mode"

[wolfyreload]

More and more people are using tablets these days. I need to attempt to make OpenChords a little more touchscreen/tablet friendly.

Tablet Mode needs to do the following in Edit Mode:

• Replace the menu with a ribbon menu in the main application.

Tablet Mode needs to do the following in Presentation Mode:

• Replace the Presentation menu with a toggle menu button
• Make options like increase/decrease font size, change key etc into buttons
• Add buttons for moving song a screen up and down and moving from next and previous song
• Bonus point add swipe support for moving between songs

[wolfyreload]

The framework that I'm using (Eto.Forms) does not have a built in ribbon control, so I won't be changing the menu to a ribbon control

[wolfyreload]

I've only added buttons to make navigation a little easier when using a touchscreen device in presentation mode