Add multiline input support to prompt

[PedroSantosWEBDEV]

My English is bad but I believe I implemented multiline input, however there are still some problems:

QEMU.2025-01-24.16-10-30.mp4

Some of the issues found:
When I use arrow up and arrow down!

QEMU.2025-01-24.16-26-07.mp4

[vinc]

Hi, thanks for the experiment! There are indeed some edge cases when implementing multiline support that would make the code a lot more complex.

The goal of this OS is to keep the complexity relatively low in order to be able to understand every part of it, so in the end I decided in the last release to keep it simple by limiting the length of a line to 80 chars in the prompt library, it's not perfect but it's okay for me in practice: #704