Feature Suggestion: Improve display of pilot skills in pilot Barracks/Contract card

By default, Abilifier maintains vanilla BattleTech's use of only 3 slots for skill icons in the pilot card that is used in the barracks and Lance deployment screen:

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In vanilla, this works, because there's a cap of 3 skills per pilot. However, as the number of combinations goes up, this behavior becomes less useful:


The first 3 skills of each pilot will be displayed, which may or may not be the most informative ones when it comes to selecting a pilot for a mech.

Expanding the icons to 4 is not practical, as at least one mod (MechAffinity) uses the empty space for a hover trigger for a popup.

Potential ways to improve this*:

- Exclude certain AbilityDefs from counting towards this via ID exclusion list
- Have a toggle in mod.json to display the skills with the 3 highest `"ReqSkillLevel"`
- Some kind of popup with a text only list of assigned skills?

*Theoretically, setting some of these to `"IsPrimaryAbility": false` would fix things, but that would defeat the point of making sure the player is aware of all the major pilot skills in the level up screen.

No files, tests, or entry points are named. Start by locating the pilot card used in the Barracks and Lance deployment screen, then compare the proposed exclusion list, highest-ReqSkillLevel toggle, and text-only popup alternatives. Done is not defined because the issue does not choose an approach.

Written by the indexing model from the issue text.