Alt+H could warn about likely mistakes in key bindings

[chrisant996]

Issue #49 gave a great example.

M-C-u and "\M-\C-u" both map to Alt+Ctrl+u.
However, "M-C-u" is the literal keys M-C-u.

It can be hard to notice the mistake when reading (or writing) an inputrc file.

One way Clink could help is for the clink-show-help command (Alt+h) to print a warning about key sequences that start with "M- or "C- in emacs mode (but not in vi mode, since vi mode works differently and those might be real key bindings there).