MOBI-283 pagePanel fixed positioning unreliable

mobi:pagePanel has been redesigned to use static positioning and simulated fixed positioning by calculating the viewport dimensions and dynamically adjusting the size of the content region. This has the added benefit of allowing for dynamically sized headers or footers, whose height is now dynamically inspected instead of being fixed at 40px.

git-svn-id: http://anonsvn.icesoft.org/repo/icemobile/trunk/icemobile@39486 8668f098-c06c-11db-ba21-f49e70c34f74
MOBI-969
FlipSwitch disableOffline support

git-svn-id: http://anonsvn.icesoft.org/repo/icemobile/trunk/icemobile@39487 8668f098-c06c-11db-ba21-f49e70c34f74