talkatu/talkatu

A bunch of random cleanups/fixes for TalkatuView and TalkatuInput
gtk4
2022-02-02, Gary Kramlich
68f23f6ebc61
A bunch of random cleanups/fixes for TalkatuView and TalkatuInput

This still doesn't fix the input, but it fixes a number of other issues.

Testing Done:
Ran the demo

* verified the extra menu of `TalkatuInput` worked
* manually verified that the event controller callbacks were called
* manually verified that the notify callbacks were called.

Reviewed at https://reviews.imfreedom.org/r/1279/
syntax: glob
*.pyc
*.ui~
\#*.ui\#
syntax: regexp
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