Fixes and add styles for tooltip, hints
- add menu tooltips styles
- add hints styles for image dimensions & name
- add styles for remove image from preview icon
- replaced preview panel pillars DIVS with :before & :after
- fix blur event trigger when inner element clicked
- remove buggy less source maps
- add namespace to transition event to avoid removing click
event
- switch custom-icofonts to css to avoid unnecessarly running
less preprocessor