Fix Terminal Character Bugs.

[figuerom16]

Fix for #9
The buffer cuts some chars in half since UTF-8 isn't always 1 byte.
Returning the byte and prepending it to the next buffer fixes the issue.
Also changed bufLen from 4069 to 4096.

Added:
If columns or rows changes during handleOutput then break loop.
It looked like output was being fully rendered for every size change which was sluggish.

[andydotxyz]

Great catch thanks, just a question inline about reducing appends.

[figuerom16]

This is having some issues still. More of the buffer is getting through than I want.
EDIT: Fixed it. Needed to update increase num by the length of leftOver to get the terminal to refresh correctly.

[andydotxyz]

Thanks for this, not sure about one of the optimisations though.

[figuerom16]

Refresh not Resize for the previous commit.

[andydotxyz]

Thanks :) I appreciate your work on this project