DONE re-implement go to bookmark operation
DONE highlight bookmarks
DONE show highlights in footnote view
DONE don't draw all bookmarks, filter by position
DONE restore end position for old bookmarks
	** save restored position
DONE save bookmark style
DONE change style (color) for bookmarks: user interface
	** edit styles
	** add/remove styles
	DONE menu on bookmark tap
DONE watch bookmark changes
DONE fix selection bookmark range
