RazorMount: Fix rounding

Fixes #522
initial fix for #520 XdgDesktopFileCache::getDefaultApp cache wrong behavior
fixed #516 Display desktop widget size when resizing them
XdgDesktopFile: Don't strip quotes
Sysstat panel plugin: collapse when vertical panel is autosizing prevented
Merge pull request #528 from kuzmas/sysstat-fix

Sysstat panel plugin: collapse when vertical panel is autosizing prevented
Notepad plugin: Resize correctly after edit mode

Thanks to Patrik Bachan for investigating (#529)