new helpers to simplify area definition
fix top-right board info click
refactor area mapping helpers so it can add other attributes to div
minor click fixes
mouse clicks for reply options
map ctrl-shift-s to ctrl-s in testing mode
fix the color of first gesture
simple image preview
clear img width and height at hide to fix the resize bug
init img position before show
enhence mouse gesture to support a sequence of directions, e.g. "right down"
reduce minimum mousemove event sample number from 5 to 1 to stop the annoying context menus in a too short gesture