all: generate json, not code

This includes modifying horsebot to use the generated JSON, as well as
moving the generator to another cmd/ directory.

Remove the generated code while we're here.
Koka tests still have to be updated, but it requires a JSON parser.

cmd/horsegen/sql/spark.sql

@@ -0,0 +1,20 @@
+WITH spark AS (
+	SELECT
+		n."index" AS "id",
+		n."text" AS "name",
+		d."text" AS "description"
+	FROM text_data n
+		LEFT JOIN text_data d ON n."index" = d."index" AND d."category" = 172
+	WHERE n.category = 147
+)
+SELECT
+	sf.factor_id,
+	spark.name,
+	spark.description,
+	sf.factor_group_id,
+	sf.rarity,
+	sf.factor_type
+FROM spark
+	JOIN succession_factor sf ON spark.id = sf.factor_id
+WHERE sf.factor_type != 7 -- exclude Carnival Bonus
+ORDER BY sf.factor_id