Rewritten skill_tree parser in a more robust way

- Fixes an issue that prevented skills with more than 4 pre-requisites
  or more than 3 pre-requisites and a minimum level from being parsed
  correctly (and without any warning or error messages).
- Removes the limit on 5 pre-requisites (replaced a fixed size array
  with a VECTOR)
- Reduces memory usage of skill_tree from 794kB to 440kB (32 bit) or
  523kB (64 bit).
- Fixes an issue that prevented multiple inheritance from working
  correctly in rare cases (incorrect definition order), without any
  warning or error messages. Now a warning is displayed if a job is
  inherited before being defined.
- Fixes an issue that prevented skills inherited from being correctly
  merged with the skills defined for the current job.
- Prevents a job from inheriting itself by accident.
- Correctly detects skills defined twice for the same job.

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

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