Viridian Forest fixes and enhancements

- Fixed various tile port issues and made various visual enhancements. Now generally closer to the Kanto styled Viridian Forest.
- Added Lass Ikue, a trainer referencing Ikue Otani, to the area where the Yellow Lass was. Required updating the spriteset but it seems fine.
- Added parties for all the trainers, which were missed on the initial import.
- Fixed various inaccurate capitalisations.
- Fixed gate warps. Considering adding a Honey girl here if we ever do that?
- Restored various RBY NPCs in the Pewter and Viridian gates to the forest, saying largely the same stuff. Just keeps things move lively.

data/tilesets/forest_kanto_collision.asm

@@ -64,3 +64,14 @@
 	tilecoll FLOOR, FLOOR, WALL, WALL ; 3f
 	tilecoll WALL, FLOOR, WALL, FLOOR ; 40
 	tilecoll FLOOR, WALL, FLOOR, WALL ; 41
+	tilecoll WALL, FLOOR, WALL, FLOOR ; 42
+	tilecoll FLOOR, WALL, FLOOR, WALL ; 43
+	tilecoll HEADBUTT_TREE, TALL_GRASS, HEADBUTT_TREE, TALL_GRASS ; 44
+	tilecoll TALL_GRASS, HEADBUTT_TREE, TALL_GRASS, HEADBUTT_TREE ; 45
+	tilecoll WALL, TALL_GRASS, TALL_GRASS, TALL_GRASS ; 46
+	tilecoll TALL_GRASS, TALL_GRASS, HEADBUTT_TREE, HEADBUTT_TREE ; 47
+	tilecoll HEADBUTT_TREE, HEADBUTT_TREE, TALL_GRASS, TALL_GRASS ; 48
+	tilecoll TALL_GRASS, TALL_GRASS, TALL_GRASS, TALL_GRASS ; 49
+	tilecoll TALL_GRASS, TALL_GRASS, TALL_GRASS, TALL_GRASS ; 4a
+	tilecoll TALL_GRASS, TALL_GRASS, TALL_GRASS, TALL_GRASS ; 4b
+	tilecoll FLOOR, FLOOR, WARP_CARPET_DOWN, WARP_CARPET_DOWN ; 4c