Adding ability to change application font size

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 68.42105% with 6 lines in your changes missing coverage. Please review.

Project coverage is 82.61%. Comparing base (300b4fe) to head (a892120).

Files	Patch %	Lines
...s/preferences_dialog/general_preferences_widget.py	53.84%	6 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #822 +/- ## ========================================== - Coverage 82.67% 82.61% -0.07% ========================================== Files 85 85 Lines 4532 4549 +17 ========================================== + Hits 3747 3758 +11 - Misses 785 791 +6 ``` | [Flag](https://app.codecov.io/gh/chidiwilliams/buzz/pull/822/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chidi+Williams) | Coverage Δ | | |---|---|---| | [Linux](https://app.codecov.io/gh/chidiwilliams/buzz/pull/822/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chidi+Williams) | `81.88% <63.15%> (-0.07%)` | :arrow_down: | | [macOS](https://app.codecov.io/gh/chidiwilliams/buzz/pull/822/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chidi+Williams) | `81.93% <63.15%> (-0.09%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chidi+Williams#carryforward-flags-in-the-pull-request-comment) to find out more.

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