Add flag to ignore errors in custom sections (#833)

If a wasm engine fails to parse a custom section, it must not be an
error. In wabt we often won't want to continue if a custom section can't
be parsed, but it still may be useful to be able to continue.

This change adds a new flag `--ignore-custom-section-errors` to
`wasm2wat` and `wasm-validate`, which will partially parse a custom
section with errors. This could lead to some strange behavior (partially
completed data structures), but generally should be safe to do.

See issue #378 and the discussion on pull #830 for more info.

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