Refactor: jumpstart sets must use shared code to generate single boosters

[JayDi85]

Jumpstart is special booster type of x20 cards. Cards split by themes instead random:
https://mtg.fandom.com/wiki/Jumpstart

Xmage support it by special jumpstart game mode only (see JumpstartPoolGenerator and \resources\jumpstart\jumpstart.txt).

Problems

1. There are 3 jumpstart sets, but only 1 supported:
   • 2020 - Jumpstart
   • 2022 - Jumpstart 2022
   • 2024 - Foundations Jumpstart
2. Jumpstart boosters supported by special game mode instead any;
3. Half decks jumpstart from Ravnica: Clue Edition

What can be done:

• improved code of JumpstartPoolGenerator to use predefined boosters from all 3 sets instead 1;
• override createBooster and use shared code from JumpstartPoolGenerator to generate single boosters (see code example from MysteryBooster);
• so jumpstart boosters can be used in all other game modes after improve;

[tiera3]

There are also Jumpstart Boosters for BRO, DMU, LTR, MOM, ONE. You might want to consider allowing them to be generated also.

[JayDi85]

Current xmage has limitation by sets structure and GUI: only one booster type per set allowed. It must be reworked someday to support multiple booster types per set.

[JayDi85]

Additional jumpstart style deck and booster: Ravnica: Clue Edition (it used x2 half decks to combine instead x2 full decks like original jumpstart)

[tiera3]

All jumpstarts are 2x half decks.