without the height of the close button widget
This will make room for one more menu item entry and fix#355 and #394.
The larger tap zone for close button widget is still there.
This should finish the work to make all globals to local variables.
That allows LuaJIT to properly compile things by interning the
references to the relevant parts (rather than looking up globals
all the time which stops a trace).
The original menu layout needs manual dimension calculations
such as white padding for displaying page information in
footer as the title, all item contents and footer are stacked
in one VerticalGroup. Out-of-bound error(koreader/koreader-base#43)
will occur in some corner cases if we missed something in
the calculation. The patch sent in this PR invented a new
layout for menu widget in which no manual calculation is needed
for displaying the footer. And the footer will be placed well
inside the menu frame.
+--------------+
| +----------+ |
| |+--------+| |
| || Header || |
| |+--------+| |
| |+--------+| |
| || Item || |
| || Item || |
| |+--------+| |
| |(Vertical | |
| | Group) | |
| +----------+ |
| Footer |
|(OverlapGroup)|
+--------------+
