bash: add `lspart`
gtk3: remove icon theme setting

I don't remember why this was needed.
gtk2: remove icon theme setting, clean up
msmtp: temporarily switch to 'smtps' port

For some reason, with my server I instantly get a

    msmtp: TLS handshake failed: the operation timed out

even though it only takes half a second. Works fine with Gmail though.
ssh: hosts (new IP addresses)
ssh: hosts (+ theos)
ssh: lower ControlPersist
environ: rain: set default SSH/GPG agent socket paths
gtk2: remove unused toolbar style
gtk3: turns out an icon theme is needed

In Openbox (that is, without XSETTINGS) it uses something that's
GNOME-ish but _not quite_ Adwaita. Which is odd, I wonder if I have
something in ~/.local/share/icons/ that goes the wrong way.
xprofile: start mpDris2 for non-GNOME sessions

It _should_ be autostarted via XDG, but won't really hurt to start it
twice (even if it's an ugly thing to do) – mpDris2 is able to replace
an older instance.