talkatu/talkatu

Set layout managers for our GtkWidget subclasses
gtk4
2022-02-01, Gary Kramlich
bfd93f3bfba1
Set layout managers for our GtkWidget subclasses

Also disable the GtkBuildable for TalkatuScrolledWindow for now.

Testing Done:
Ran and verified the size allocation runtime warnings were gone.

Reviewed at https://reviews.imfreedom.org/r/1276/
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[Test link](https://pidgin.im)
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