mediafilespreviewer: Make the previewer work with cluttersink
viewer: Make the AspectFrame part of the ViewerWidget
mediafilespreviewer: Make sure the ViewerWidget does not expand
Move the gitignores to a single file
bin: Make sure we use python2 on systems from the future
mainwindow: Get rid of generic try/except when previewing
mainwindow: Move the preview window size logic to a new method
Remove retired maintainer
Remove obsolete svn file
mediafilespreviewer: Fix the PreviewWidget expansion
mainwindow: Remove unused variable setting logic
mainwindow: Don't close the window when it loses focus

On window managers like i3 it's easy for the window to loose the focus,
for example when resizing it with the mouse, and when this happens the
window would close.