feat(games): use regional_support and national_support

[robinjoseph08]

°₊·ˈ∗(( ॣ>̶᷇ᗢ<̶᷆ ॣ))∗ˈ‧

• instead of relying on NATIONAL_ONLY_GAMES, rely on db value of regional_support
  • i also made the db have regional_support = true for xy, oras, sumo, and usum so we'll support regional gen 7 dexes as well
• rely on national_support to potentially not allow national dexes for a game. this isnt used now, but will be for lets go
• the default value for "new dex" is always the latest game
• change all references to specific games (e.g. the word alolan in various places)
• fixes Editing dex's available Pokemon doesn't update until page is refreshed #311

[ami]

ok a couple things.

(1) SOMEtimes... not always.. when you go to a dex, the setting/unsetting of catches doesn't work. like the count on the top goes up, but the box doesn't turn yellow. so you'd think it's just a style thing, but also when you try to unclick it it also doesnt un-mark it. unfortunately i didn't figure out a great way to reliably reproduce it and also idk if that is due to this branch, or api changes, or if it's an issue in prod as well. haha. but here's a video:
https://imgur.com/a/hF0Jkwg

(2) ran into #311 -- since you're here, is it easy to fix that?

lgtm functionality wise other than that!

[robinjoseph08]

nice catch! fun fact, it was actually the same issue so fixing one fixed the other lol

[ami]

lgtm!