Added option to strip hard line-breaks from `mes` dialogs

- The `\r` character, in a `mes` dialog, is normally represented by the
  client as a hard line-break.
- Since a client may have different requirements in line lengths (for
  example using a font with different size or metrics), an user might
  wish to ignore hard-wraps and let the client automatically soft-wrap
  instead.
- If you want to hard-wrap (official default), keep the
  SCRIPT_MES_STRIP_LINEBREAK define commented out.
- If you want to let the client soft-wrap automatically (may work better
  for custom clients), uncomment it.
- Imprved HULD handling of `\r` (to avoid control characters in the
  generated file)
- Please note that this requires cooperation by script writers:
  * Each `mes` should contain one and only one sentence, possibly
    without using the '+' concatenation (but, rather, sprintf).
  * Two separate sentences (where a hard-wrap is required even for
    soft-wrapped text) should always go into separate `mes` commands.
  * Following the above two recommendations, also produces a better
    quality translations .pot file.

Signed-off-by: Haru <haru@dotalux.com>

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