Removed undocumented setr command. It was never meant to be available.

- The command implementation is kept, with an internal-use prefix, to be
  used by the script engine (for direct assignment commands).

Signed-off-by: Haru <haru@dotalux.com>
Marked the petheal command as deprecated

- The command should be replaced by petskillsupport in any custom
  scripts.
- Updated the custom SOHEE pet skill script to use petskillsupport with
  level 10 AL_HEAL.

Signed-off-by: Haru <haru@dotalux.com>
Removed use of 'menu' from official (non-custom) scripts

- Some scripts were partly refactored/rewritten to use a more modern
  coding style (and to fix some issues)
- Note: the 'menu' command will be deprecated soon in favor of 'select'
  and 'prompt'.

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