Add corners options to some showcases (#44)

* Add corners option for Strixhaven showcases, Amonkhet Invocation, Dungeon Module, Secret Lair Full Art, and Unstable Basics
* Added option to remove name background from Unstable Basics
---------

Co-authored-by: cajun <12363371+CajunAvenger@users.noreply.github.com>

data/magic.mse-game/card_fields

@@ -2597,59 +2597,8 @@ card field:
 	card list name: Partition Select
 	card list column: 620
 	card list width: 100
-	choice:
-		name: before normal
-		choice: 0
-		choice: 1
-		choice: 2
-		choice: 3
-		choice: 4
-		choice: 5
-		choice: 6
-		choice: 7
-		choice: 8
-		choice: 9
-	choice: A
-	choice:
-		name: after normal, main set
-		choice: B
-		choice: C
-		choice: D
-		choice: E
-		choice: F
-		choice: G
-		choice: H
-		choice: I
-		choice: J
-		choice: K
-		choice: L
-		choice: M
-	choice:
-		name: after main set
-		choice: N
-		choice: O
-		choice: P
-		choice: Q
-		choice: R
-		choice: S
-		choice: T
-		choice: U
-		choice: V
-		choice: W
-		choice: X
-		choice: Y
-		choice: Z
-	choice:
-		name: help
-		choice: This is the partition selecter
-		choice: You can use this to sort cards in different sublayers
-		choice: 0-9 go before the main count, like face commanders
-		choice: A is the main count
-		choice: B-M go after, but still count in the set total
-		choice: N-Z go over the set total, like #301/300
-		choice: You can change the flip point in the Set tab if you need to
-		choice: with option "Last main partition", which defaults to M
-	initial: A
+	include file: /magic-modules.mse-include/information/choices_partition
+	default: default_partition()
 card field:
 	type: text
 	name: partition