^⌘0 resets font size

[luah5]

Description

• ^ ⌘ 0 now resets the font size to 12
• also makes the font increase and decrease commands into one grouped menu like Xcode, see below

Related Issues

• close #1554

Checklist

• [x] I read and understood the contributing guide as well as the code of conduct
• [x] The issues this PR addresses are related to each other
• [x] My changes generate no new warnings
• [x] My code builds and runs on my machine
• [x] My changes are all related to the related issue above
• [x] I documented my code

Screenshots

https://github.com/CodeEditApp/CodeEdit/assets/128280019/ad435336-3f82-45c5-a9d9-0fd1d5b201c7

CodeEdit:

Xcode:

[austincondiff]

Is it safe to assume that 12 is the size it should be reset to? I wonder if there should be a zoom multiple stored and zooming in and out increases/decreases the multiple instead of the font size. Then resetting zoom sets the zoom multiple to 1.

@CodeEditApp/maintainers thoughts?