added support for font files

only for TTF, OTF, WOFF formats
[Image] fixed init function
added ps-input class
[FileTree] some fixes in the 'drop' delegate
speedup startup
reemit 'resize' event
[Image] visual improvements
fixed bug which allowed to write in hidden fields
[Menu] changed timeout to opening submenu
new application icon
removed KioskMode
update submodules
changed the way of loading themes
a lot of changes in the Findbar
changed the appearance of about-app
[FileTree] delete folders recursively
[FileTree] improved file renaming
[FileTree] added "New folder" to contextmenu
[File] use lang value instead of string
[File] inheritance from EventEmitter