Change Conditions to be RPG-Specific

[jayden-hunter]

Pull Request Description

Add support for conditions to be Rpg-specific. I.e. If the system is set as Pf2e, then the Pf2e conditions will be loaded.

Changes Proposed

Add Pf2eConditions, and restructure the conditions so that they are linked to the RpgSystem.

• moved condition.ts into a conditions folder, renamed to dnd5eConditions
• added pf2eConditions
• added support to change conditions in the settings menu, based on the system.
• added support to keep custom conditions when swapping systems.

Related Issues

#276

Checklist

• I have read the contribution guidelines and code of conduct.
• I have tested the changes locally and they are working as expected.
• I have added appropriate comments and documentation for the code changes.
• My code follows the coding style and standards of this project.
• I have rebased my branch on the latest main (or master) branch.
• All tests (if applicable) have passed successfully.
• I have run linters and fixed any issues.
• I have checked for any potential security issues or vulnerabilities.

Additional Notes

• I had to call display() in the settings menu to propagate the visual update for conditions from the XP setting box - there may be a better way I am unaware of.
  • This may be indicative that the rpgSystem should be higher in the hierarchy of settings? It doesn't just affect XP anymore. I didn't want to go so far as to make that change, though.
• Also, I plan in future to see if I can implement the logic of the conditions in pathfinder through this and/or fantasy-statblocks. Ie. Off-Guard I would love to reduce AC by 2, but that's a fairly big job and this is what I imagine the start would look like.
• The default settings confused me - I had to remove the [...Conditions] in DEFAULT_SETTINGS. In my testing this wasn't an issue, but potentially could error if you are loading the plugin for the first time? I was unclear on how I should handle that (or if I already had... the settings menu was a little confusing to wrap my head around).

[jayden-hunter]

Noting that this might conflict with #323, since I added a new attribute to RpgSystem. Happy to fix this when/if needed!