show 50 ticks on the mini progress bar at most
expand/collapse TOC only by tap on the icon
Merge pull request #1019 from chrox/fix_1017

Fix #1017
use new FFI based mupdf API

This will use the new API where the Lua/C interface was used before
and also drop usage of mupdfimg wrapper which is now implemented
within the mupdf interface
update to latest base