Security handlers manage encryption and decription of PDF files. The
standard security handler uses RC4/MD5 to perform its crypto (AES as
well, but that is not yet implemented).
This implements the rotate cw/ccw actions in PDFViewer.
Since the rendered pages are stored in a HashMap for caching,
the bitmap is wrapped in a struct with the current rotation.
This way the caching works as expected while zooming, and a new bitmap
is rendered when the page is rotated.
The open_outline_action logic was backwards resulting in it
being closed on the first click and opened on the second,
and opposite if document->outline() was true.
There was also a collision with the Ctrl+O shortcut for opening a
document, this changes it to Ctrl+S instead.
This commit also changes the wording to 'Toogle' instead of 'Open/Close'
since the text wasn't updated as expected, and lastly, add a View menu
with the action.
Applications previously had to create a GUI::Menubar object, add menus
to it, and then call GUI::Window::set_menubar().
This patch introduces GUI::Window::add_menu() which creates the menubar
automatically and adds items to it. Application code becomes slightly
simpler as a result. :^)
go-up.png and go-down.png don't exist (and would look silly here, with
the buttons being next to each other horizontally). Use go-back.png and
go-forward.png instead.
