✨ Update replaceCharacters function to be able to skip Selection update until after full change

[hi2gage]

Description

This improvement will allow for multiple lines of a selection to be modified before updating the selection. This will be helpful for fixing CodeEditApp/CodeEditSourceEditor#304.

Alternatives Considered

We considered using a state machine to hold the state of the character replacement

Additional Context

No response

Screenshots

No response

[thecoolwinter]

I believe this is closed with #87.