edopro: Use writeShellApplication for launcher script, keep assets in subdirs

- Use WriteShellApplication for the launcher script, since that provides some good default shell options
  and runs shellcheck on the code
  - Fix any issues reported by shellcheck
- Keep assets in subdirs with corresponding edopro version
  Since some of the assets tell the game which game scripts to download, where to look for them, and which servers to
  look at for online play, and managing this across versions could be messy
- Check for multiple subdirs and issue warning about migrating data
  Let's not try to solve this ourselves, the user will know best if, and what, they care about when switching between versions

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