Work around more SN/dbusmenu quirks

[serebit]

Description

Adds a quirk for tooltips of type string (TeamViewer). That resolves #429.

Also adds some additional checks for containers to potentially work around #437.

Submitter Checklist

• [x] Squashed commits with git rebase -i (if needed)
• [x] Built budgie-desktop and verified that the patch worked (if needed)