add scaleByDPI and use it in touchmenu
use scaleByDPI in all widgets
listen swipe gesture in touchmenu
add page counting in touchmenu & bug fix for sub_item_table
more minor cleanup
remove done todo
add exitReader so we can save G_reader_settings properly
forgot to add exitReader at the end
when kpdf.sh start with no argument, it will actuall pass in ""
Merge pull request #803 from houqp/new_ui_houqp

some minor adjustments & finished up touchmenu