Use system proxy settings in cinnamon-settings
Add settings for cinnamon-session timer
re-add deprecated keybinding schema to allow migration script to work
Merge pull request #3661 from RavetcoFX/b28

[Cinnamon-session] Add settings for cinnamon-session timer
Merge pull request #3659 from linuxmint/proxy

Use system proxy settings in cinnamon-settings, closes #2172
Makepot
2.4.1
photoframe desklet: fix mega leak, don't cache all images, destroy old images.
photoframe desklet: cancel the update timer when removing the desklet.