Added icon textures for pan and continue
Added PageBounds script & prefab

Changing Pages to not manage Bounds directly.
Added simpler Page handling, manual pan mode and more

- There is now only one Page game object. It is created automatically
by the Game class on startup.
- To control Page layout, use the new SetPageTop(), SetPageMiddle(),
SetPageBottom(), SetPageRect() & SetPageBounds() commands.
- You can still specify Page layout in the editor using the new
PageBounds script & prefab, using the SetPageBounds() method.
- Replaced Game.mainCamera with built-in Camera.main
- Added StoreView() and PanToStoredView()
- Game class now handles rendering fade texture (instead of
CameraController)
- Game class handles rendering pan / continue icons
- Added new StartManualPan() and StopManualPan() commands to manually
pan between 2 views
- Removed continueStyle class & prefab (replaced by continue icon
rendering)
- Removed Game.activeView as it’s not needed
- Parallax factor can now be controlled in X & Y
- Reorganised command classes
- Added PanToPosition() command
- Pages now default to display full-size at bottom of screen.
- Changed Page.VerticalAlign to Page.Layout and provided better options
for controlling how the page automatically resizes.