feat(settings): option to disable reply mentions by default

[mini-bomba]

Description

adds this nice setting into the general/editor category:

default enabled, toggling it off makes your replies not mention the user you're replying to by default, without removing the ability to toggle it back on per reply

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings