feat: Download Text Mode buffer

So, I am making my own mini textual bootloader OS. Problem is, I'm making a sort of Command Prompt to test my assembly skills. How it works, is when built, it launches a https://copy.sh/v86/?profile=custom&fda.url=... type of link. (I read the source, fda.url is the URL for the floppy image for which I use a Base64 Data URL)

I'm currently testing what ASCII value do the keys I input print out. For normal letters or numbers, this is self-explanatory. However, for something like the Enter key, Meta (⊞ for Windows and ⌘ for Mac) key, Ctrl key, Escape, so on, this isn't so explainable. So, I tested the Enter key first. It moved my cursor a bit, which is weird, and probably some compilation-to-WASM bug, granted, but I wanted to see what ASCII value does Enter give off. Turns out, I won't know until I can download the textual output the emulator has, including the special characters that seem to move the cursor around.

So that's why I'm requesting a way to download the buffer from Text Mode as a .TXT (or a .BIN (possibly)).

It would be much more useful than just for devs like me. What if someone painted amazing ASCII art in their emulator, only for a bummer to appear as you can only screenshot for now? Sure, saving as an image is more convenient, but at least add a dropdown to either save as an image or a text file.

And of course, make it only enabled only when Text Mode, Graphics can't be downloaded as text (unless the ▄ and/or ▀ chars with a bit of ANSI colors)

Thanks for reading, I hope you all like my suggestion to further improve your awesome WASM emulator, and I really like the whole idea of compiling binaries to WASM.

edit: found the char for enter key, it's just \r. the reason carriage return moves is still unknown to me tho.