Implement Viewer Navigation

[winterdl]

I used to read manga by tachiyomi app, they implemented several viewer navigation types beside up down volume buttons, I think it is good if you support one of these kinds:

RightAndLeftNavigation
/**

• Visualization of default state without any inversion
• +---+---+---+
• | N | M | P | P: Move Right
• +---+---+---+
• | N | M | P | M: Menu
• +---+---+---+
• | N | M | P | N: Move Left
• +---+---+---+
  */

KindlishNavigation
/**

• Visualization of default state without any inversion
• +---+---+---+
• | M | M | M | P: Previous
• +---+---+---+
• | P | N | N | M: Menu
• +---+---+---+
• | P | N | N | N: Next
• +---+---+---+
  */

EdgeNavigation
/**

• Visualization of default state without any inversion
• +---+---+---+
• | N | N | N | P: Previous
• +---+---+---+
• | N | M | N | M: Menu
• +---+---+---+
• | N | P | N | N: Next
• +---+---+---+
  */

LNavigation
/**

• Visualization of default state without any inversion
• +---+---+---+
• | P | P | P | P: Previous
• +---+---+---+
• | P | M | N | M: Menu
• +---+---+---+
• | N | N | N | N: Next
• +---+---+---+
  */

[gsioteam]

Ok, I got. I think one version in the future for improving the view page UI. At that time this feature will be added.