Add alt-screen support #98
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closes #48
Uses the xterm-style "?1049l" & "?1049h" escape codes to use the alternate screen buffer of some ANSI terminal emulators to avoid overwriting the data displayed on the terminal before Kilo was started. Includes a command-line argument to suppress this same behavior. Ensures that if the alt-screen WAS NOT used, then the cursor is placed on a new line directly BELOW the remaining displayed lines of Kilo, so that new commands can be typed without altering the visibility of what Kilo had previously displayed.
So: implements alt-screen, provides a command-line override, and ensures that things look nice if the override is used.
I've also added maintainer & contributor files, but I don't know if the project has a rule on those?