build-updated files for 0.9.0
replaced appinstance with GtkApplication
updated descriptors and devices doc for Anywhere MX
install the application icon in hicolor/scalable/apps
install the .desktop file in /etc/xdg/autostart (fixes #77)
fixed some awkward path joining stuff
fixed #75 (pair button disappearing)
on alert popups, selected the device that triggered the popup
only popup the window once per device on battery alerts