Print only literal values when printing literals (#2469)

Current `<<` operator on `Literal` prints `[type].const` with it. But
`[type].const` is rather an instruction than a literal itself, and
printing it with the literals makes less sense when we later have
literals whose type don't have `const` instructions (such as reference
types).

This patch
- Makes `<<` operator on `Literal` print only its value
- Makes wasm-shell's shell interface comply with the spec interpreter's
  printing format (`value : type`).
- Prints wasm-shell's `[trap]` message to stderr

These make all `fix_` routines for spec tests in check.py unnecessary.

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