Column Selection

### Description Adds column selection when pressing option and dragging to select. ### Related Issues * closes #46 ### Checklist - [x] I read and understood the [contributing guide](https://github.com/CodeEditApp/CodeEdit/blob/main/CONTRIBUTING.md) as well as the [code of conduct](https://github.com/CodeEditApp/CodeEdit/blob/main/CODE_OF_CONDUCT.md) - [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 Demo, ignore the multiple undos at the end a fix for that is on it's way. https://github.com/user-attachments/assets/409aa49c-eed2-465f-a964-162920c8877d