fakedos() should exit on non-ASCII keys (F1...F12, directional keys, etc)

[MestreLion]

Currently the only way to exit fakedos() is to type a fake rogue command, but the original also returned to game on any non-ASCII key press. The culprit is that now getinfo() ignores non-ASCII keys instead of aborting entry, which is suitable for all other text entries like Rogue's Name on title screen, naming potions and scrolls, etc, but it breaks fakedos() original functionality.

A possible solution is to split getinfo() in 2 methods: one for "regular" text entries, possibly a thin wrapper to curse's getnstr(), and another one dedicated to fakedos, reverted to original behavior.