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Refactor TTY input handling

Hanicef requested to merge Hanicef/SRB2:refactor-tty-input into next

This patch is a cleanup of the TTY input logic, which simplifies a lot of the code, fixes a few TTY-related output issues and makes it behave more like a typical UNIX application. This is what has been changed:

  • Line clearing is now done with carriage returns instead of backspaces, which fixes a lot of issues when printing lines while the prompt is non-empty.
  • Console output handling is greatly simplified, and now handles partial lines properly.
  • EOF (Ctrl+D) from console is now respected and will shut down the game once received (most UNIX applications have this behavior).

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