No way to set size of scroll buffer

[Alan Pope 🍺🐧🐱 🦄]

Running a long command (such as stracing something) can result in a lot of data in the terminal to scroll back through.

However, the amount of data we can go back to is not known or specified to the user. You can scroll back some way and then it stops which is frustrating if you ran a long running command with a lot of output and that has scrolled off the buffer.

We should have a setting to allow the user to set the size of the scroll buffer. It should default to a sane value (such as 500 lines) but the user should be able to set it larger. We may also want to warn the user that a large buffer will consume more resources and eventually cause the kernel to kill the app if it gets to large.