* Since fontchooser is replaced by selectmenu, it
is no longer needed. So I rewrite it into font.lua
module which can cache faces that shared among all
UIs.
* add progressBar method in graphics.lua to draw
reading progress.
* add reading progress information in reading menu.
It is just a demo. Should be clean up in next release
when the real reading menu is out. :)
Now you get a instance rotate :) With only one bug.
I have to restore to previous rotation state of the
native system after exists. Because the native system
does poll the new rotation state that changed by ioctl.
Currently, I don't know how to force the native system
to detect the changes.
