conforms file names to consistant standard

scripts/resources/level_config.gd

@@ -0,0 +1,11 @@
+class_name LevelConfig
+extends Resource
+
+@export var author: String
+@export var display_title: String
+@export var game_seed: int
+@export var hero_class: HeroClass
+@export var allowed_cassettes: Array[Cassette]
+@export var waves: Array[WaveConfig]
+@export var points_blocked: Array[int]
+@export var zone: ZoneConfig