Formation flag removal for usurping and reforming formables

[rogerburks]

I have started a project to provide decisions for allowing, probably usually the player, to re-form cultural union tags for instance: re-forming Yugoslavia if they can annex it and fit the normal requirements. My idea for this is, if one is very close to a formable, it should not be prevented if another tag simply has a much easier path to it.

However, I believe that the formable itself must be annexed before this is made possible, so that the process is challenging but remains possible. A scenario would be: Someone is playing as Montenegro and is close to forming Yugoslavia, but Serbia outraces them. If Montenegro can annex Yugoslavia, it can then remove the flag yugoslavia_formed and can then reform Yugoslavia.

I have made a new decisions file, cch.various.txt to house small decisions like this, to avoid keeping them in older HFM files. The localization will be stored in cch.fixes.csv.

I think it could also be possible for me to include fixes suggested in #81 in this project as well.

[rogerburks]

So far a list of tags investigated:

• Germany: Does not need this. You can already annex Germany, then become either the NGF or SGF and then become Germany.
• Italy: Does not need this. You can already annex Italy and re-form it.
• Scandinavia: This now works, although it is good to know that in abolishing Scandinavia, I temporarily remove SCA cores from Schleswig-Holstein, to make formation fair. They return once you form Scandinavia again. It will not work if you remove all SCA cores everywhere, since that breaks the allow of form_scandinavia. Additionally, if a tag gains leader_of_kalmar, it does not block anything, since there is a decision usurp_kalmar to take this flag away from the current leader. It requires that they are not a great power anymore but your tag is.
• Yugoslavia: Fix works.
• Transcaucasia: same fix applied as in Yugoslavia
• Turkestan: same fix applied as in Yugoslavia

Others which may require different fixes:

• Indonesia: I suggest providing a separate decision for Indonesian tags to use after organization.
• Yemen: I think (I may be wrong) that I have this covered in Aden protectorate formation modified #111 , but if not, I can address this later.
  - Tukulor Empire: Does not need this. You can already annex it and reform it. Incorrect. This can be fixed with a simple edit (which is done in the associated pull request).
• Ethiopia: Does not need this. You can already annex it and reform it.
• Arabia: It may need a fix to return cores, although I am not sure there is a use case for it. It seems like the Arab Union is probably well within reach by that point.
• Malaysia, Laos, and some others: Since the ai does not normally form these, I do not plan to suggest fixes for them (and they may not need fixes).