fix "save prefs on exit". Thanks Joseph A Philbrook for reporting and support ideas
implemented #41 Request: Ctrl+M Disable Menu Bar Option
fixed #31 does not resize itself when screen resolution has changed
initial support for extended bookmarks (read only for now)
bookmarks: saving/loading/editing
bookmarks: key shortcut to open/close bookmarks widget
changes required for new qtermwidget build/structure; includes fixed for qtermwidget Qt5 port
removed un-needed file
Include QApplication where needed. Fixes #47
Merge pull request #48 from jleclanche/master

Include QApplication where needed. Fixes #47
save bookmars widget visibility; fix crash in some config circumstances
fixed #49 Only show monospace fonts in the font picker
fixed #50 Bookmarks panel always shows, even if the bookmarks are disabled
fixed #51 Shortcuts broken after menu hiding