Lavender Crypt/Haunted House tileset + other tileset improvements

- Lavender Crypt/Haunted house tileset added with custom palette
- Sideways cave added to one of the Nihon tilesets for the sake of quiet cave
- Citrine tiles added to kanto tileset. I forget if I was totally finished with it but it's probably fine

gfx/tilesets/lavendercrypt.pal

@@ -0,0 +1,40 @@
+; gray
+	RGB 18, 17, 24
+	RGB 12, 12, 18
+	RGB 07, 07, 12
+	RGB 00, 00, 00
+; red
+	RGB 18, 17, 24
+	RGB 14, 07, 17
+	RGB 10, 03, 10
+	RGB 00, 00, 00
+; green
+	RGB 10, 18, 15
+	RGB 09, 13, 08
+	RGB 06, 09, 04
+	RGB 00, 00, 00
+; water (blue)
+	RGB 13, 12, 31
+	RGB 10, 10, 27
+	RGB 08, 08, 23
+	RGB 00, 00, 00
+; yellow
+	RGB 30, 30, 11
+	RGB 17, 12, 17
+	RGB 10, 03, 10
+	RGB 00, 00, 00
+; brown
+	RGB 18, 17, 24
+	RGB 17, 12, 17
+	RGB 11, 06, 08
+	RGB 00, 00, 00
+; roof (purple)
+	RGB 20, 14, 26
+	RGB 14, 09, 19
+	RGB 08, 04, 12
+	RGB 00, 00, 00
+; text
+	RGB 31, 31, 16
+	RGB 31, 31, 16
+	RGB 14, 09, 00
+	RGB 00, 00, 00