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core: implement backarrow key mode (DECBKM) - mode 67 (#12226) master

This mode allows programs to modify the code that the `backspace` key (backarrow key in DEC parlance) sends. If this mode is `off`/`false`/`reset` (the default, the same as before this PR), we send the byte `0x7f`. If this mode is `on`/`true`/`set` we send the byte `0x08`. <img width="659" height="715" alt="Screenshot From 2026-04-09 11-00-25" src="https://github.com/user-attachments/assets/4f3e14ac-757d-4bb2-9fc5-b17019ad35d5" />


+155 -15
6 changed files