Rewrite the escalation service to use group contracts

[RDIL]

Now squashed!

[AnthonyFuller]

What's left to be done with this?

[moonysolari]

Waiting for Kaki to get all the latest escalation group definitions and level definitions from official.

[VolkerSchlegel]

Most escalations are done, our custom escalations still don't have group definitions.

[AnthonyFuller]

One little snag, but other than that LGTM. Not checked any of the contracts we've added/moved as from experience in playing a few, they're all good.

[moonysolari]

LGTM. The escalation level picker needs to be fixed/updated afterwards. Doesn't have to be part of this PR though.

[moonysolari]

Also we need to make sure whether we want to include legacy escalations or not.

Theoretically they should always be included in H1, but not in H2/H3. Therefore I think we can include them in the code but only show them for H1, and toggle their appearance on H2/H3 with a flag. Choosing to do this will also remove the need for the legacy escalations plugin.

[AnthonyFuller]

Just fixed the escalation level picker. Was a simple fix as I just had to change how it accessed the escalation mappings and got the level count.

RE: Legacy Escalations
If we're including them in core Peacock, there's no reason to keep them behind a flag for H2/3 as they will work on those games without any extra intervention, and if we're going to add them to H2/3, we'll have to add the challenges too just to be complete.

EDIT: In addition to this, including them into core Peacock will increase the file size, and then hiding them behind a flag just seems pointless as people may never play 2016 or enable them.

[AnthonyFuller]

Requesting changes just to stop merging before Escalation Codenames has been updated with all the new H3 escalations we've added.

[AnthonyFuller]

Added the new H3 escalations to Escalation Codenames. Should be good to go now.

EDIT: Also fixed some issues with escalation completion. What we're going to do with Legacy Escalations still needs to be decided.

[moonysolari]

What we're going to do with Legacy Escalations still needs to be decided.

I agree that they can be added to all game versions.

[AnthonyFuller]

What I just pushed makes the hits category for elusives respect the new Season tag, this now removes The Deceivers from the page when playing in Hitman 2016.