Shell: Be more smart with pasted stuff

Shell can now use LibLine's `on_paste` hook to more intelligently escape
pasted data, with the following heuristics:
- If the current command is invalid, just pile the pasted string on top
- If the cursor is *after* a command node, escape the pasted data,
  whichever way yields a smaller encoding
- If the cursor is at the start of or in the middle of a command name,
  paste the data as-is, assuming that the user wants to paste code
- If the cursor is otherwise in some argument, escape the pasted data
  according to which kind of string the cursor is in the middle of
  (double-quoted, single-quoted or a simple bareword)

0 files changed, 0 insertions, 0 deletions